It was a long pending idea to introduce a series of free webparts, which we think will help you achieve more.
We are open to ideas, please feel free to suggest what sort of webparts will you like here?
All the products will be placed at http://webparts.pointsharepoint.com/
The first one coming out of the factory is a "Join a Group" webpart, which enables the end user to join a Group (Where "Allow requests to join/leave" this group is enabled). Here is the teaser :