iGuitardude2744 has put together a nice youtube video of his top 30 Cydia Tweaks.
All of the 30 tweaks are shown on a jailbroken iPad 2 with a quick demonstration and explanation of the tweak.
There is a few that I haven’t heard of along with some very popular Cydia tweaks. I’m sure most people will find at least a few that you want to try.
Top 30 Cydia Tweaks:
Tab+, Multiconmover, Infiniboard, Infinidock, SBSettings, Alphacon, Android Delete, Graviboard, Grid Lock, Animate Battery, Winterboard, Flipover, List Launcher, Cy Delete, Folder Enhancer, Pull to Refresh Safari, RetinaPad, Barrel, Camera Wallpaper, icon renamer, double tap to open, Pagenames, iSwipe, Stayopened, iTypeappleicon, retina app, icons, page pusher, Bytafont, AndroidLock XT and Insomnia.