I was up and running installing third party software within an hour. There are little quirks here and there installing and uninstalling software. For instance sometimes I noticed that a soft reset doesn't load all the way and it took me like 4 or 5 soft resets for it load correctly.

Overall I like it better than WM2003 because I can turn WiFi on and off at will without a soft reset and same goes for BT. That was so annoying before!

So far I'm running the following software:

Pocket Breeze
Marsware Weather Panel
Pocket Informant
Wisbar Advance
Resco File Explorer
Resco Registry
Skype
SPB Finance
Cingular Xpress Mail
Bejeweld 2