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mine are:

adblock
appbackup
appsync
backgrounder
five icon dock
ifile
insomnia
makeitmine
notifier
openssh
sbsettings
sms counter
spotbright
volume media settings
winterboard
 
1- iRealQuickSMS
2- Backgrounder
3- SBSettings

I have others but without a doubt those 3 have to be the most useful.
 
In order of importance to me:

iRealQuickSMS
Backgrounder
SBSettings
5 icon dock w/ Dock Flow
Categories
Safari Download Plugin
iFile
Winterboard
xGPS
dTunes
CyDelete
AptBackup(haven't had to use yet)


I used to have StatusNotifier and pretty heavily modded themes, but I noticed such a huge battery drain that I had to remove them. I now am experiencing excellent battery life so I'm pretty content!
 
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