I use the Sony Ericsson M600i and its really good. I could do the following:

- Sync my contacts, notes and appointments in Outlook within seconds of plugging.
- Read and send the company's email since migrating to Exchange 2003 with OMA.
- Browse Yahoo! and Gmail.
- Browse the internet as well.
- Type in emails and text messages easily with a QWERTY type keyboard.

Its pretty handy and slim. Bad part that it does not have a camera, but don't need it naman eh.