Congrats.
I'm currently using a work iPad instead of personal, so have cut down on app installs, but ones I use most often:
Reeder (RSS)
Instapaper (essential for long text - use with Longform.org)
Kindle
iA Writer (with RAM on 1G, need something to assemble clippings as Safari refreshs - many alternatives including nice Simplenote if you sync)
Google Mobile (Google Apps)
HootSuite (Twitter)
SkyFire Browser (Flash videos), CloudBrowse (Flash animation)
Netflix (justifies iPad cost alone if you watch in bed)
DropBox
ABC Player, PBS, Daily Show (video)
The Big Picture
Remote, Squeezepad (if you have a Squeezebox), WunderRadio, This American Life, WFMU, MOG (last three iPhone apps, but a must)