Take a look at this nice overview by iguitardude2744 of 30 Cydia Tweaks that you might want to try for your iOS device.
My personal top 30 Cydia tweaks of 2011. The tweaks chosen are both new and old, popular and unpopular. 30 is a big number so, I hope that most of you are able to find a tweak that you will enjoy having on your iPhone, iPod Touch, or iPad. The tweaks are my personal picks and we all will have our opinion. I know that there are allot of other awesome Cydia tweaks that I was unable to mention but, feel free to tell us about them in a video response or comment.