As Shared Spaces uses Wave technology, there are already 50 different gadgets available, including shared maps, scheduling tools, polls, Sudoku games, and drawing boards.
Shared Spaces seems to be a fairly easy way to quickly share a workspace with a friend or colleague. You simply share the space's URL to invite others to join. There's a chat box for real-time communication, but it appears that the work space persists, meaning you can use it for longer-term work as well.
So, will more folks adopt Wave in this format?
(Here's the direct link to Shared Spaces.)