Some of apps i have/used to have, thought i share what i liked, altough most of them are useless
MX Player - in case theres lack of good default video player, this is a good one
Adobe Flash Player 11 - can't be downloaded from google play anymore, but if you download it its the only way to run embedded yt vids in sites
Adobe Photoshop Express - some photo editing, maybe be quite useless tbh
Aldiko Book Reader - best book reader imo
AndroZip File Manager - zip manager
Angry Birds - cool game
Angry Birds Space - like ^, but even cooler imo
Bad Piggies - cool game
Battery HD - app that analyzes battery usage and tells how long you can do something before battery runs out
Best Wallpapers & Backgrounds - nice bowser for wallpapers
Chrome - much more features and is faster than default browser, unfortenatly default browser scrools much more smooth, so i use both
Fruit Ninja Free - cool game
Google Goggles - point camera at something and google will try to find it for you
Google Translate - translate
Messenger WithYou - MSN mobile
Metal Detector - kind of silly, but cool how it actually works, using digital compass sensor
My Tracks - record your running/cycling path, get average speed, etc
Scan - take a photo of those rectangle codes and it'll find product or url for you
Skype - skype mobile
Steam - steam mobile, doesnt inclue games for android
Street View on Google Maps - actually helped me finding something
Twitter - mobile twitter
OfficeSuite Viewer 6 - viewing powerpoint/word/excel etc documents, editing in paid version
Notification Toggle - for some phones where the wifi/bt/etc toggles is lacking at notification screen this adds them, and is very customizable
Temple Run - cool game