Aeons ago, I was an avid user of StumbleUpon, a great way to discover interesting sites around the web. Sadly, that service died the death of a thousand cuts (of features) and I ended up leaving it. :(
A few days ago, I came across Stumbled which is the spirit of the old StumbleUpon renewed. :) There is a very discreet text advert at each Stumble, and not all sites will open in a frame due to security settings, but that’s not their fault and they detect it and offer a button to let you open the site directly.
It’s not a replacement for my RSS feeds, but it is a nice way to amuse myself for a few minutes (or longer if I find a particularly interesting site).