There are some sites which fits is to this category like popurls, oroginalsignal etc. Alltop features news or commentary from the top bloggers or sites in a particular niche. There are nine categories in Alltop including politics, science, gaming, egos, celebrities, fashion, mac, oddities, sports. The intersing section is egos featuring Robert Scoble, Fake Steve Jobs, Guy himself and Michael Arrington.
What is missing in Alltop is web20 or tech section, which they left out to show their appreciation to popurls. Alltop is useful if you want the cream of all the news or commentary from the blogosphere.
Alltop has nothing new but what makes it interesting is Guy is involved in this. Guy is an example of the power of branding yourself in the web2.0 era.