Many people have been wanting to import their existing e-mail address books into Gmail; address-book import is a feature the Gmail folks say they're planning but haven't released yet. To fill that void, I've updated gmail.py, my Python Gmail interface (see previous entry), to add methods to retrieve from, add to, and delete from your Gmail address book. Now importing and exporting is possible.
It's still raw Python code at the moment; it just needs a snazzy user interface and bindings to popular e-mail address-book formats. Any Python coders out there want to collaborate? Leave a comment or contact me.