Do you use Mail/gmail? I use K-9 Mail to allow for imap idle push and that it doesn't require background data to check mail (it has its own setting).
If background data is on, your phone is going to get lit up.
For whatever reason on my Evo, the first 6% of my battery life is gone in 6 minutes. I dunno what the reason is or why. It declines pretty steadily until about 30% (not at the begining rate), and then its a power beast. After i hit 30% i had to work hard to get that thing to fully drained. Anyone else get that?
But that's since last boot. Did you reboot after doing a full a charge?
my Wi-Fil also works fine, no problem and i don't think it drains much battery. I tested the Bluetooth headset they gave away in Best Buy for people who pre-ordered their Evo's and it's actually pretty bad ( looks pretty cheap, too) - the call quality was bad, while the call quality on the Evo itself was beautiful. Good reception in Boston, too.