Google Reader has a lot of useful keyboard shortcuts, but most of them only replace a click or two. For example, you can star an item by typing s or go to the original page by typing v.
But there's also a somewhat hidden view that can be activated only using shortcuts. If you type gu, you'll see a list of all of the blogs you've subscribed to. You can use the arrows to navigate to a feed or start typing the first letters from the feed's name. There's also a similar view for labels that can be activated by typing gl. This might be convenient if you have a lot of feeds or just to feel in control.
{ Via Lifehacker. }