Groovy actors

I've been reading up yesterday about an interesting concept called groovy actors:

IMO, this is a very interesting and powerful programming model. Now, my brain is working hard, trying to figure out some interesting ideas that could be implemented with 'actors'.

How about a "loosely-coupled demand/supply engine" where some people submit their "needs" and others submit their "offers" and the system does the matching and bring the parties together. Kinda like craigslist, but without people actually manually searching through the classifieds. Instead, they just express their needs and the system does the rest...

Another one, could be the automated "matchmaking engine", etc.

Does something like this exist already?

Later...