I'm very happy to announce that the Gmail team has made a nice tweak to their atom feeds, you can now pull feeds based on Gmail label. For instance, if you have a label named "lkml" related to your favorite mailing list and you want to know when something is posted there, you can simply subscribe to https://gmail.google.com/gmail/feed/atom/lkml. More info can be found in the Gmail help center.
Also, we have a new project that we're releasing. This is the first API example we're releasing here on Google Code. In keeping with our love of Python, we are releasing the Kongulo Google Desktop Search plugin. Kongulo is a spider for GDS that makes it easy to crawl sites behind your firewall. Our hope is that people might use it as a template for implementing new plugins for GDS. The Kongulo Python source can be found on SourceForge.