mosted used apps:
BeeJive - great instant msging, $12
DSLRemote - great for photographers $20
Consume - think its free, this manages ALL your usage for pretty much anything you want, whoever you're with, manages your phone usage, internet, whatever you want, even diners club cards
ANZ - banking app, pretty much a link to the website =/
iFitness - manages workout routines, links routines to muscle groups, gives examples of how to do excersises and tracks your progress
Facebook - dur
XBMC - manages media centre over the network.
Air Share - wifi FTP program
Dominos - pizza.
Tripview - plans trips, easy to use.
SHOUTcast - internet radio
games : Fieldrunners, geoDefense, s.deadbeef, Peggle, Angry Birds, Ovenbreak.
thats pretty much all i use, i keep my apps to 3 pages.