Please do not post here unless you have definitive results from a controlled test!
There are some apps out there that aren't letting our devices sleep, causing people to have TERRIBLE battery drain!
LET'S TAKE BACK OUR BATTERY LIFE!
I'm going to work here under the assumption that the stock apps on my Epic4g are not to blame. So what's left to do? Wipe CLEAN all my new apps from the device, and install them 1 by 1 while testing for screen not sleeping and other battery drain issues.
I will be editing this 1st post as I add each app and discover if it's GUILTY or INNOCENT of draining my precious battery! I encourage you to do the same, please compile a list like the one below, please specify if you're rooted or not, and for GUILTY apps PLEASE BRIEFLY SUMMARIZE THE BATTERY ISSUE THAT COMES WITH THE APP. I'm calling on the power of this brilliant community to squash this bug!
GUILTY APPS:
Thanks to
DaddyMikey1975 for bringing this to my attention. According to
this over at XDA and
fix for battery issues on Android Forums it seems as if Samsung and/or Sprint need to update our radios. Our devices are set to WCDMA by default. So they're searching for a WCDMA tower and can't find one. This could prevent the phone from going to sleep as well.
To check and see if your device has been plagued w/ this illness, to go
Menu > Settings > About Phone > Battery Use > Cell Standby.. look for "Time without Service".. Mine was at 52%.. THIS could kill our batteries as well as keep the phone from sleeping. This also explains why Juice Defender works so well. It shuts down the data connection, thereby preventing the phone from hunting for a WCDMA signal and allowing the device to sleep.
*EDIT* This appears to have been fixed with the DI07 update...
GPS. Try turning this off and only using it when you actually need it, see what happens with your battery life.
INNOCENT APPS: 
Advance Ruler Pro
ADW Launcher
Air Control (air traffic control game)
App manager
Armored Strike (Tank Game)
Asphalt
Beautiful Widgets (and a ton of clock/weather themes) +1
Bloo
Tetris
Chomp SMS
Contact Widget
DirecTV
DirecTV Sunday Ticket
Dish Pointer Pro
Dungeon Hunter (Gameloft-High Rez 3d game)
espn fantasy football '10
engadget
Facebook
FoxyRing
Funambol sync
Google Goggles +1
Google Voice
Google Maps Update
Google Sky Map
GPS test
Guitar Hero World Tour
homerun derby 3
iRadio
Juice Defender (with Ultimate Juice add-on)
Kayak
Lithium Music Player
Live Wallpapers: Stonerview app, Galaxy
Lookout (I do not have virus scan enabled FWIW)
Mabilo wallpapers
Maps (google maps)
Nesoid
NFS Shift
Palringo
Pandora +1
pdanet +1
Physx Live wallpaper
RadioTime
Retro Camera
Scan2PDF Mobile
ScanLife
Scanner Radio
Slacker Radio
Snowflakes Live Wallpaper
Solitaire Deluxe
Sound Manager
Speed Test
Superuser
Teeter
Tikl
Tunewiki
Twitter
TV guide mobile
Ultimate favs pro
Weather & toggle widgets
Weatherbug
Wells Fargo
wireless tether pre 9
wordfeud
XDA app
Yahoo Fantasy Football '10
Zedge.
POWER HUNGRY APPS
(Innocent apps that drain battery quickly, like YouTube)
All GAMES
Exchange Sync
Fring
Push To Talk
Yahoo Fantasy Football