I tried google reader long time back and wasn't impressed. I had been using rojo for a while since then. However after its relaunch and increase in traffic from Facebook I took notice of it again and liked it this time around. I don't know how Scoble keeps up with 600 feeds... I have hard time keeping up with just over a hundres I follow. But grouping feeds helps me focus on feeds I really like and those which I can ignore for long time. I you are interested in find out what I'm reading check this out. [ My public Google reader feed]
Facebook is the latest app I've been looking at. After using Orkut, linkedin and plaxo it seems like Facebook's Platform OS idea is what will differentiate it with other social networking sites. Plaxo's feature, pulse, was a very interesting idea which notified me everytime someone's flickr account gets updated. I also found out when my contacts were changing jobs, moved houses or changed phone numbers. Facebook had a similiar interface called "News feed" to keep friends/contact informed about what you are up to.