Check out blogdigger. This service allows you to aggregate several RSS/Atom feeds into a single Web page from which you can then generate a new, compiled RSS feed (to be consumed anyway you choose).
I found this service while working on our DTLT community Web site where I had been consuming a feed for each of the blogs generated by each of the DTLT staff members. This wasn’t working very well because of the amount of space it took up on the page (particularly since it showed the most recent posts for each blog even if they were pretty old). What I really wanted was one feed that would compile the most recent posts from each of our blogs–enter blogdigger.
I can also see how you could use it to create a group of RSS feed that you could then access from any computer via the Web–and consume in any aggregator. Pretty cool.