One of the really cool features of google reader that I didn’t mention is the way searching for new blogs/rss feeds works.
Right beside “Add Subscription” in the navigation pane, click the “Browse >>” link.

You’ll see a screen now where you can choose predefined feed bundles, or enter a search term to match.

Once you do enter a search term and google reader’s found some matches, it gives you a listing and the ability to subscribe to each match.

Click the subscribe button on any that you want:

And right there, in very cool and handy style, is the ability to categorize it by moving it to a folder. No need to go into “manage subscriptions” at all.

Everyone knows google makes cool web apps, using ajax where appropriate, and generally not when it isn’t, but reader is, so far as I’ve seen, a great example of doing the right things for the task at hand and ignoring things that would be extraneous.