Importing contacts in bulk to Gmail isn't really that smooth (at least for me). Apparently, Gmail 2.0 only supports headers like First Name, Last Name and Email Address .. it doesn't even support Phone and Instant Messaging .. or is there actually a way to do it .. just that I don't know?

Plaxo has a great address book syncing.
But I think for Gmail it's only one way for the moment...
Maybe one day, they'll have it two way.
There is also a limit for 1000 addresses in the free version...