This Alltop social media blog aggregator is stunning. Alltop's other blog aggregator's are also worth checking out. Here's how good Alltops aggregator is: when I went to their FAQ page and saw they might list me if I mentioned them...which I already had done...I sent them an email stating that fact. They listed me the next day. I'm the last blog on their list, but they listed me.
As for all the Alltop Startups, see: Rich Guy Startup Pitch Rules.