Wow! I don't know what the AOKP devs, OP, or houstonn (or anyone else who worked on this ROM) did, but battery life is amazing!
100% charge at 6:30a when I took it off the charger. It's at 84% now, so ~2%/hour. Normal usage (gmail, greader, tapatalk, facebook, opera mobile, sms, a couple phone calls, various calendar alerts). Wifi and data radios managed by JuiceDefender.
Previous ROMs, including stock, would have the battery down around 50-60% by now.
So, whatever you folks are doing, keep it up! And share it with the other ROM devs.
Edit: here we are, 31 hours later, with 16% battery left.