Similar to Feedmarker, all the community tags (folders you keep your RSS feeds in) are visible on the front page for all to see.
Only thing is that you can only subscribe to a topic tag within Feedtagger (as far as I can see it doesn’t expose it’s RSS feed so you can subscribe to it in another RSS Reader…this is not the case with Feedmarker).
When is Bloglines going to make their folders into sharable tags (that have RSS feeds) and present them on a hompepage to search and discover them.
In essence we are seeing these new RSS aggregators form community directories of RSS feeds…what a great idea!
Everyone is keeping their feeds in folders, so why not make these folders public by putting them into a user-named directory or list.
Another example of folksonomies..augmenting or leveraging the organization of information that is already there, just need to list them together and it forms it’s own directory (according to what users think).