Google Shared Spaces are collaborative gadgets based on Google Wave technology. Current gadgets include finding meeting times, simple yes/no/maybe RSVP and shared shopping lists. Developers can use the Google Shared Spaces API to create their own gadgets. Currently the service uses the Google Wave Gadgets API. However, since Wave has been deprecated, these gadgets can run instead in Google Shared Spaces.
Google has a lot of APIs, more than any other company we track. Perhaps as part of adding many APIs, the search giant also has to remove them from time to time. Recently the company has become more liberal in its platform pruning, with at least three separate announcements this year. Most recently Google dropped three more APIs, including the Google Buzz API.
Google Wave was seen as one of the spectacular failures of 2010. While the product did not find resonance with the users, the underlying technology that was used in it has been winding its way to acceptance ranging from getting incubated in Apache and a new offering from Google labs named Google Shared Spaces.