My cydia apps:

Action Menu = Add more options to action menu (like copy, paste)
Activator = Make ur own gesture!
AnyAttach = attach files using mail app.. think its not working..
Barrel 2 = Add fun when switching pages!
BiteSMS = must have!
Callbar = Incoming call handling redesigned!
Cyntact = Profile picture in contact list
Display Recorder = Record the display in real time
Displayout = Mirror screen on tv/monitors
FolderEnhancer = Folder improves, faster and better!
FullScreen for Safari = Improved safari experience
iFile = Best file manager
MultiIconMover = Move multiple icons at same time, very handy!
MyWi 5.0 = its so awesome that bought it for $20 to support dev, too bad now I use Personal Hotspot more (cuz less battery consuming)
ProTube = download utube videos!
Remove Background
SBSettings = _still_ better than UISetting or BBSetting imo
SpringFlash = flash light on physical button!
Springtomize 2 = So much customizations, cant even list half of it!
WeeSpaces - See overview of running apps / pages under notification center
YourTube 2 - YourTube 3 not compatible and crashes when trying to open video.. use iFile instead
Zephyr = Swipe up from bottom of the screen to show running apps, Swipe left right to switch apps
3G Unrestrictor = Use skype/facetime/download big apps over 3g

Honourable mention but not installed:

Five Icon Dock = Put 1 extra icon on dock (can use Springtomize instead)
Winterboard = I'm not into theming
Dreamboard = shows potential but again, i like my default iphone theme just fine
IntelliscreenX = wait until I have 10 bucks to spare

This post has been edited by fizyboy: Jan 25 2012, 12:16 PM

Well for me whatsapp is more for group messaging, but individual texting I still prefer iMessage, besides biteSMS is soooo pretty. So there!