I'm too lazy to do fancy QR codes like that, but here's a brief list to add to some of the excellent ones you've listed.

Swype (You'll have to search for it. Not on the market)

http://code.google.com/p/android-wifi-tether/

imgur

Grooveshark

Qik

reddit is fun

USAA

Puzzles (Simon Tatham's Puzzles ported to Android)