Google rolled out a “extensions gallery” intended to make it easier for users to discover the fun and useful extensions you all are building with the Google Wave APIs. “Simply look for "Extensions" in the navigation panel of Google Wave. The gallery is simply a set of waves containing extension installers (the puzzle pieces). As a tip, you can also use the waves in the gallery to share a direct link to your extension's installer with other Google Wave users -- simply open the installer and copy-and-paste the URL (note: the panel arrangement and search query are included in the URL, but can easily be edited out),” noted Google.
In other news, there's also a new Robot API, if you're a developer -- it's been awfully quiet on the Wave front.