I just realized that there is yahoo site explorer.
Basically I use Google analytics to analyze the impact factor of my sites. Google Analytics is a great tool. It has a lot of features and it is free! I would strongly recommend getting into it if you have not tried it yet. There is another cool online tool from Google: Google Web master tool. This is another tool which you can enjoy for free.
However, for a different test I wanted to test Yahoo site explorer .
Currently, I am just looking at the Inlinks and analyzing it.