Hi everybody!
When I had to transfer contacts from TREO 680 to HTC Hero I did the following:
1. On your Palm|TREO go to contacts
2. Choose contacts category to display "business", "private", etc. For All contacts - obviously select "All"
3. Press MENU button and choose "Send Category"
4. Then choose "e-mail", "bluetooth" or "beam" - this will export your contacts in *.vsf file (I used e-mail)
5. Go to Gmail, select "Contacts", then Import
6. Locate your *.vsf file and import your Palm contacts into Gmail account
7. Edit if needed
8. Enjoy
This method can be particularly useful for those who experience problems of syncing TREO with PC.