FeedTagger is a new online RSS service that lets you upload your feeds via an OPML file. Once you have uploaded them, you can organize them using tags.
If you really like organizing your information using tags (think del.icio.us), then you should give this a try.
UPDATE: I added the link. Sorry I forgot to include it.
Care to give us a link?
http://www.feedtagger.com/ seems to be it.
Feedmarker does the same thing but also allows you to keep your bookmarks there. It also has a nice user intrface powered by HTTPXmlRequest so everything is smooth.
It is like Bloglines meets del.icio.us meets HTTPXmlRequest ..
See: feedmarker.com
Thanks Scrivs