Well, I turned in my 360 today at EB for a new one. I mentioned the "E74" error and they're like, "Oh, gotcha. Here's your new one." That quick. I even got the extended warranty on the new one, so I'm good for another year.
My born on date as of now:
8/25/06
Now I actually have to go and open it. They were nice enough to swap out my hard drive.
-Brad