I too follow both erts and ttwo. I am hoping erts falls some in order to get in long, but i am very long ttwo. Ive actually scaled back my investment recently, but only because it was dominating my portfolio. The fundamentals are excellent, and as a sidenote, the board is even better in my humble opinion at discussing the gaming sector than the erts board. Ranting and raving is not tolerated there, and short and long posts are exchanged and debated with intelligence and respect instead of the usual junk. You should read over the posts over there to get an excellent start on your dd.
Yes I'm long quite heavily on TTWO, and while I used to be mostly long ERTS I've more recently been shorting it. Also used to be long ATVI from $6 last summer but got out. I'm holding TTWO until $16 and I think they're a good bargain play in the industry with a lot more upside than downside. I haven't traded any other games companies. TTWO has a good amount of internal development as well as their profitable distribution business, and if they get a big hit (like ATVI had with Tony Hawks) then their stock could fly. Hopefully Oni which comes out for PS2 at the end of January will be that hit.