Here are applications for the P800 that I really like:

• ActiveDesk: When you flip open the phone, a summary of your calendar entries, tasks and messages appears. I like it better than Handy Day, YMMV
• Tipic is a Jabber chat client that supports AIM, ICQ and Yahoo Messenger. Cool!
• SymIRC is an IRC client

Both are written in PJava and perform really nice. A fully connected phone, good GPRS coverage and connectivity applications are a great thing. I’m reconsidering my sceptisim on “mobile connectivity”.