Colin asks:

One thing, your ‘Great Sources’ is this like links or places we can find new blogs or news to subscribe to?

Yes, exactly.

Does the source have to be RSS/XML feeds? It seems so, so far. Or can it be a blog directory or search engine?

The Great Sources will be a mix of all of the above. I haven't quite figured out what I want to put in there yet. There will be pages with a "bulk subscription" button, where you can subscribe to everything at one -- say "the top 10 entertainment blogs", for example.

Note that you don't (usually) have to find the RSS/XML for a blog: just drag a link -- even "entry" links -- onto the window and Jäger will figure out the rest.