I've had my Xbox 360 for about 2 1/2 years now and never once got the RRoD.  I still haven't but it looks like I'm going to have to replace it anyways.  I was playing some Left 4 Dead with my brother yesterday when suddenly the picture started flipping out.  We restarted the console and it happened again about half an hour later.  It seems to me like the problem's with the GPU.  Here's a video I took today of it.  

Yea, thats the gpu alright. At least its still in warranty. Send that crap out right away. 
 
Also, if you get back an older model, maybe you should consider trading it in for a newer slim xbox360 at a local gamestop or something. Just a suggestion. 

 Yeah, then it game me an E74 yesterday when I turned it on, so I finally navigated their support site of broken links to request a repair.  I'll probably end up getting a  new one today so I'll have something for the month or so it'll be gone to be fixed.  Then when I get it back I'll have an extra one for my brother or something. 

Here's a question we can add to this mix - what models did Microsoft say don't have to worry about RRoD anymore?  Was it as soon as they came out with the Falcon boards?