As I posted earlier, auto-discovery is already done and will be in the next beta release.
Barry Paul has written a toolbar plugin for Internet Explorer that searches a page for RSS feeds and opens the Channel Wizard in Awasu for you to subscribe. Look for the "Description" and "Download" links in the sidebar on the right.
I had been mulling over how to get Awasu to do auto-discovery in browser windows outside of Awasu for a while now. It's a bit tricky but I'll still do it since it will integrate much better with Awasu (e.g. it will figure out if you are already subscribed or not) but this is handy in the meantime. Thanks!