One of Google Wave’s more powerful features is its extensions — small gadgets and doodads you can embed or include in waves to add great functionality. They used to be particularly difficult to hunt down and install, but no more.
The new Extensions gallery (found by clicking Extensions in the navigation panel) takes a lot of pain out of finding and installing a new Wave extension. It doesn’t have all of our favourite gadgets, but it’s a good start. Unfortunately there’s still no easy way to install a gadget that isn’t included in the gallery, but this method should still work. In the meantime, it’s good to see Wave making it easier for regular users to find and enjoy new gadgets.
Introducing the Google Wave Extensions Gallery [Google Wave Developer Blog]