Its pretty obvious that Kristina Frye is Red John. She makes the only sense in the entire show. The other characters have no weight or legs to stand on to be Red John.

Pretty sure Patrick Jane's 7 member list definitely has Red John's accomplices on, but she is the puppet master stringing them along.

I read a submission somewhere here where the submitter spoke about the He Is mar - and that Jared Renfrew meant to write He Is marionette (The definition of Marionette - A marionette is a puppet controlled from above using wires or strings depending on regional variations. A marionette's puppeteer is called a Manipulator).
Remember Jared didnt know who Red John was, but only said that he had really important information on Red John.

She makes the only sense if you have watched the entire series, and add it all up.

She is the only character who as shown similar mental superiority to Patrick
She also mysteriously disappeared during the Season 2 finale and conveniently Red John shows up to save Patricks life from the student filmmakers/copycat killers., recites a Tyger,Tyger poem and then leaves Patrick with the Rolltide statement.
Also when she disappeared from heavy police protection, her passport was taken as well. (Why would Red John do that if she wasnt Red John)
She as survived the fatal on TV dissing of Red John
She shook Patrick's hand
She knows that Patricks daughter was asleep when she was killed (Psychic powers come on - she was there so she knows)
Painting of toenails is definitely a women's thing
She has not been present in the show for a while, so this would be a major twist. A writers method of getting viewers to forget about a character so that it would be a major surprise when Red John is revealed.

I think Rosalind's physical description of RJ can be ruled out, for two reasons:

1. PJ's list of suspects (if it is assumed to be complete and real) does not strictly adhere to how Rosalind described Roy to be.

2. When Lisbon asked if she was on the list, PJ said she isn't, because he'd call what they have a friendship, and not because she's female, and RJ is male, according to Rosalind. 

Now, I'm not saying that RJ can't be the way Rosalind described him to be- I'm just saying Jane doesn't trust her description and isn't bounded by it.

I also think the list of suspects is not complete, again for two reasons:

1. We are all forgetting about the "He is Mar/Man" clue written on the wall when RJ's accomplice died. Other than Ellis Mars, it doesn't exactly point to anyone else on the list.

2. RJ is a very central part of the show, he's almost as much important as PJ. But the suspects, i.e. RJ's assumed alter ego/real identity have hardly ever been seen to be interesting, or of any importance to the storyline beyond a few things here and there or a few episodes. RJ has to be someone who has a connection to Jane, in my opinion, because otherwise, it just falls short of the show's intriguing dramatic twists.

Another thing: correct me if I'm wrong, but when PJ gave the interview that got his family killed, he was already approached by police to help catch RJ, right? Given how connected RJ is, and his obsession with PJ, what are the odds that he himself had set that up?

I'd like to believe that RJ is someone from PJ's past, simply because he is so obsessed with PJ. RJ killed the other serial killer who mocked him on TV, but PJ, he's kept alive and has been toying with, even deviating from his MO to mess with Jane. 

I think it'd be someone Jane shook hands with back in his own life, but forgot to factor in, just for the shock factor. RJ's revelation is the climax of the shock, it has to be important.

If RJ is indeed any one on the list, PJ can just shoot him and get on with his life. He is not even close to any of these people- in a love or hate way, their death is not going to affect him in any way. But RJ, I'd like to believe, would pose a question to PJ.

Anyone agree?

Something I thought didn't make sense.  At the end of the first season finale the guy that Jane shot said that red john 'wanted you bad'.   For what???  He has his chance to do whatever he wanted to do to Jane at end of 2nd season finale but does nothing. 

I think, RAY/K could be right with the theory but with the addition, that I'm not shure, if HAFFNER is RJ (Could be but it's not safe).
Let's face the facts: The video must have been taken approximately 1 or 2 days after Lorelei got shot (look at the tape on her left arm). When she was killed by RJ, her left arm was fully recovered. Usually this takes one week or more. Do you really think, RJ played the paramedic for Lorelei and simply killed her after she recovered...mmmmmmmmmh?  
AND Lisbon is the only person on this planet PJ told, that he wants to make a list and narrow it down.
Furthermore Bruno Heller stated, that the whole video thing could seem like a kind of magic to some people, but in fact, there is nothing supernatural about it.

So consequentially someone gave this information to RJ. I think, it was not Lorelei, cause she tried to kill him but failed. I think, PJ was Lorelei's paramedic after she got shot, he asked her a favour for that and Lorelei agreed. Lorelei of cause didn't tell him RJ's real name, cause she wanted to take her own revenge. It was a sporting chance for PJ. If Lorelei would have been successfull by killing RJ, PJ shurely would be satisfied, too. If she fails (what surely happened), the video was his backup plan.
I bet, that there are at least two disks. One with a RJ Video and the other one is the disk, PJ showed Lisbon. I think RJ's disk contains a video which is also spoken by Lorelei. And I believe, it nearly contains the same tenor, than the one PJ showed Lisbon: "killing a happy memory" (I just stated in a previous post that I'm shure, PJ and RJ know each other for a long time), "a list", that PJ "narrowed down"...etc (btw RJ's video just has to contain MORE than 7 suspects. It' s a prestidigitation) ;-) and he will "start to kill often" (what a big surprise) :-)! And watch PJ when he shows the video to Lisbon. He observes her all the time. Then watch Lisbons face. Sometimes it seems like she would say: "How tf could you know".
The reason, why she gave the information with the list to RJ is jealousy. Remember: "You're a littel in love with him". RJ always lured his followers by fullfilling a desire. Finally remember JJ LaRoches statement in one of the latest episodes: "Ther is a leak inside the CBI".
I would bet any money, that the video was a bait. PJ is smart. He suspects Lisbon as a whistle-blower.
This would make sense. There is no more evidence for this theory, but on the other hand, ther is no evidence against it.

Oh! I almost forgot to say: Bruno Heller stated, that some people will be disapointed, when the truth is gonna be revealed. I believe, that he basically didn't mean RJ's true identity. I bet, he meant all the Jisbon fans.