I've just made a KNSin aggregator to provide a feed for all by blogging across the blogs and portals, and have this feed being sucked into my cLearning blog as a javascript include in my About content.
See the About sidebar in my non-techie blog, c-Learning, for an example of KNSin in action. I made a very simple KNSin aggregator to fetch my recent entries from across the blogs and portals I contribute to. I seldom get a chance to post in c-Learning and wanted visitors there to get some idea that I was still alive and writing :o)
I adopted the convention in that blog of fetching profile-ish extra feeds into the About sidebar by javascript ( this allows mashing in my delicious and flickr zeitgeists, andalso saves pageload time ). We have not had much chance to do anything with KNSin - in fact this is the first in-anger use we've made of it. I hope to get some more features and uses out of it soon, especially for generating front-of-site content and cross-site default feeds.