- From the Home screen, press the Menu key and go to Settings -> Accounts & Sync.
- Under the Manage account section go through each account (by tapping on them,) and verify that the Sync Contacts option is only checked for accounts that you really want to have synchronized with the phone.
- Open the Phone app and go to the "Contacts" tab. press the Menu button and tap the Display options button.
- Check the box next to Only contacts with phones option to hide any contacts that don't have a phone number associated with them.
- Under the Choose contacts to display section, expand any accounts that you've chosen to keep in sync in step 2, and select the groups you wish displayed in the Phone app by marking their check-box.
Keep in mind that some manufacturers have their own versions of Phone and Contacts apps, so the menu choices might be slightly different (or even missing altogether.)
Regards,
Lewis