Google Gadgets now have social features. This will be very interesting. I have developed Google Gadgets. Making them social is a great move. Like the linked Read Write Web article states, it will be a little while before the developer community makes most of these new features.
Gadgets are a great way to drive traffic. The two gadgets for my photography portfolio site drive 80% of the traffic. The Google Gadget above can be found at http://www.salmonbay.net.