My personal favorites are:

Easy Money for my banking (Purchased version)

Office Suite (Purchased version so that I can change things)

Score Mobile (being a sports nut)

Trust Go (a phone protector)

Alarm Droid (my alarms are all set up)

Aldiko Premium (Purchased) so I can read my favorite books while waiting to see the doctor, etc. Sometimes I even get to read a whole book while waiting.

Area Code so that I can check an unknown area code when I get those spam phone calls.

There are a few more that have already been mentioned, such as Color Note, that I also use.