Adobe's JamJar -- killer app for RIA's?

While many Rich Internet Applications are more or less lipstick on a pig in terms of really adding anything beyond bouncy graphics, folks are really trying to come up with RIA's that are interesting and take advantage of the features that a Flash-based ui can provide. JamJar is one of these experiments which seems to allyou to create a shared space with your friends. It has lots of bells and whistles (and shwooshs!) but the fact that it takes about 5 seconds to load (instead of having to install something on your own machine) is quite attractive. 0 install rich applications. Awesome idea. Now we just need to find an application that lends itself to this new environment.