Technorati started to use "authority" to rank blogs instead of the number of links to a blog as it was before.
They provide an authority widget which displays the rank of a blog.
As far as I understand from this post, the authority is the number of links per last 180 days

HP 49G+

I have bought yesterday

reading

1. Andy Greenberg "Condemned To Google Hell" In Forbes
2. and response by Matt Cutts (Google)
3. The Hacker's Guide to Investors by Paul Graham
4. The Ploy from The Atlantic, The inside story of how the interrogators of Task Force 145 cracked Abu Musab al-Zarqawi’s inner circle—without resorting to torture—and hunted down al-Qaeda’s man in Iraq
5.