Tablet Talk (if you have an Android phone) is a must have.
I love Pocket and Flipboard.
I agree with SwiftKey X for Tablet... Landscape mode is nuts.
There is an xkcd app, if you're into that. It remains on my home screen.
BeyondPod is my favorite pod catcher, I've been using D7 for RSS (and looking for alternatives... hint, hint).
Get a file browser, I use AndroZip.
Lookout scans installs for problems, most other features touted are likely insincere, however, due to Android's sandboxing stuff.
I use Flick Note for syncing with Simplenote. It is a great app: simple, full-featured.
Perhaps that is about it for the moment... And I do mean 'moment'
I use Nova for a launcher after using alternatives (I still use ADW on the phone). I love Nova on the Nexus 7.
Mocha VNC has been my desktop sharing go-to... I'm still having trouble with copying and pasting between desktops, however.