Syncing only your "real" contacts has been one of our most requested features, and today it is here! Google released version 2.0 of their API for contacts today. With this new version we are able to discriminate between your real contacts and your suggested contacts (which include basically anyone you have ever sent an e-mail).
We worked hard to get this out to all our waiting users, and we are happy to say that as of about twenty minutes ago, suggested contacts are no more.
The feature is automatic for any suggested contacts which Google creates from now on. However, if you already have suggested contacts on your phone we won't actively seek them out to delete them. If do you want to get rid of them, you will need to resync your contacts (instructions); and in just a few seconds you'll be free of your suggested contacts.