I've got ten bucks that says all of these resets are heat issues. I use Battery Indicator Pro and System Panel. Under high stresses, like video or high rez graphics/games and things like TeleNav, the battery gets hot as hell. I've seen it go to 110f! I had the same prob with the stock battery but not quite as hot. I have the Seidio 3500 in it now. The backing thingy that allows me to use the holster doesn't help matters any because it seals in heat.
In any case, if my phone is being used for nav, and it's in the flow of the AC, it's fine. Set it anywhere else and it resets.
Same problem last night. Lying on the couch...a little Angry Birds action...and it was a hot evening yet I had windows open rather than AC. Reset after reset. (and I do not have Fast Boot checked btw).
Turn on the AC and sit in front of it where it could hit the Evo and viola....no resets.
So, think about it....everything people are talking about doing when it resets are nearly ALL high stress activities. I don't know if it's the CPU/board/chip that actually gets hot or if it's the battery first, but eventually the battery gets uber-hot. Take your Evo's temp. When you're stressing it, feel the kickstand. That puppy really heats up.
Anyway you look at it, it's an issue....but see if most of you can't help your resets by having it in a cool environment when it happens and see if that doesn't cut down on it like it does for me.
bj