Me and Kris have been working on a FeedAggregation Engine which will get feeds as specified in a BlogList XML file and will aggregate them asychronously to provide it in the format as requested by the consumer. Right now, the engine works pretty well with RSS alone and am working still with the classes given by Kris to provide support for ATOM and other kinds of feeds.
In the meanwhile, Brian had read my post about how miserably, the effort to produce a GotDotNet Aggregated feed had failed and requested me for a latest version of the code :) i sent him over the new build of the engine which is much more stable and flexible now. Will blog more about this in detail later.
For now, here's the feed hosted by Brian providing the GotDotNet Aggregate RSS feed.
Happy blogging.