I got my N900 yesterday, installed a lot of applications and i found the N900 very stable, more so than my N810.
And it's very very fast in loading, browsing, etc. Email works fine. I put a screen of google wordproc. and google spreadsheet on the desktop, works fast enough for me...

Overall it is even better than I expected, after lurking on many sites for the last months!!

One thing: What i would like is syncing Google calender to the N900 calender though. I could get contacts using PC Suite from Outlook 07, but no other data. It states that the N900 is not yet supported. I wonder if google calender online will be fast enough in practise..