Dave says about adding namespaces to RSS v0.94:

Could peace possibly be that simple? Could RSS 0.94 be the format everyone agrees to go forward on? If not, how long would a 0.95 take to get in place?
I say: Go, man, go! And then, time permitting, weave some nice hooks into Radio's aggregator to let us make Tools that register to handle the intrepretation/display of a namespace's tags.

I'd like to play with some more RDF eventually, but I don't know that RSS is the place. The thing that I really like are the namespaces and the possibility to throw plugins into aggregators to handle alien elements.