Dont forget magpie, though it might take more coding than most people want. Seems I read it could be used as an aggregator, but sure not something ready out of the box. I use it now just to pull feeds from one give url.
So I am guessing no one has found a good script? There are quite a few sites running as aggregators, is there something wrong with those scripts?
I like Weg O web also, sure different..
ronnie