i come from a nokia E61, i do miss some things that were very easy and convenient to use, and i have somewhat lost now with the n900.

- very accessible and sorted by date notes (still looking for an app that will sort my txt files by modified date, so i can keep using and updating my old notes)
- imap idle for gmail
- native google maps app with latitude
- opera mini was great
- gmail java app was good for some things
- great battery life
- log application was awesome
- to do list in calendar app

and some things i'm sure i'm forgetting. I'm having a hard time waiting for the same level of functionality, and many things i'm sure won't get (google apps are unlikely, for example, i think..), i might end up buying a E72...