QuickOffice (snooze) is now free to anyone with a Google account and offers 15GB of storage on Google Drive.
Google Play Music is amazing.
Best browser I’ve found is NB Pro (nee Naked Browser, so called because it’s tiny and very fast)
Nova Launcher is the best launcher that I’ve used although still go back to using ADW every now and again.
There are loads of Twitter clients, none is perfect imo but I use Seesmic, Reddit is Fun for reddit.
Just started using currents, not sure if I like it or not but well worth exploring
Podkicker for podcasts.
Swiftkey is an amazing keyboard
Tune In Radio for all radio requirements.
Endomondo for sports tracking
Viewranger for OS maps
Candy Crush to suck your life and self respect from you