A while back I found out about bloglines.com. It is a web based RSS/Atom feed aggregator. Besides aggregating the many feeds that I have it also offers suggestions about different feeds that I might be interested in based on what feeds I have subscribed to.
Check out my public feed:
http://www.bloglines.com/public/spi
Since it is web based it is available anywhere I have access to a web browser and it keeps track of new posts across the different accesses. I have found it to be extremely useful and makes it so I don't have to visit a million different websites just to read new information.