Right now, it's just blogs, digg, news, and twitter, but we have a slew of services that are in testing right now that we hope to launch in the next few weeks.

Right now, it's just blogs, digg, news, and twitter, but we have a slew of services that are in testing right now that we hope to launch in the next few weeks. Aside from that, I'd say that there are a few benefits over RSS: 1. It's faster to setup and start tracking something, as all you have to do is send us a tweet. This might work especially well for stuff you just want to track for a couple days, when setting up a bunch of search feeds is overkill. 2. A lot of people still don't use RSS, but use Twitter. 3. I tend to only check my RSS once a day or even every other day, while I'm likely to be on Twitter all day, so I'll see stuff more quickly than I will with RSS. This is just off the top of my head...as I said, this is an experiment for us, so all feedback is useful :)