Configured my new Blackberry 8830 yesterday. Very impressed. Syncs with Outlook and Hotmail, and renders SharePoint pages.

Would recommend these apps:

RSS reader

Viigo Browser

Opera Mini

Google Maps

USA Today

Mobile InfoSpace

Find It! Fox

Business Mobile ESPN

Mobile WorldMate Live - if you travel a lot (free or upgrade)

Tellme

Beyond 411 or Berry 411 - Quick Google like search