I just started using Google Reader about 3 weeks ago. I'm currently subscribed to approximately 30 feeds, and I tend to skim the headlines on the busier sites, and then read whatever might catch my eye. On the slower sites, or blogs from folks that I know, I tend to read the whole article, or give up after I decide that I'm just not interested. I have it configured to purge already read posts, so I just page down the busier blogs until I finish, or stumble upon something I like. I also tend to use the mark all read after the weekend or a day or two off, since I don't have the time to sift through too much detritus from not servicing my feeds. I think with news/social news sites like reddit & slashdot, which I had subscribed to, and subsequently unsubscribed to, have too much noise to lend themselves to reading in an RSS feed.