I got the same phone about a month ago. I love it so far.
My favorite are the following:
Google Maps (for live crowd-sourced traffic info)
Yelp
Trapster (crowd-sourced hiding spot locations for radar w/ google traffic overlay)
The Weather Channel app
Advanced Task Killer
Flashlight
Compare Everywhere (uses camera to scan bar codes and compare prices online)
Google Skymap
Gizmodo has a great list of apps:
http://gizmodo.com/5423054/essential-android-apps/
And since you have multiple lines (I assuming for business and home) you might try to give Google Voice a try if you can get an invite (still waiting on my second, my first one expired).
http://gizmodo.com/5425039/how-to-to...h-google-voice
The only bad part I've found is that text messages from unknown numbers acts strange on the phone.
Chris