Google Launches Trends for Websites
Google launched Google Trends for Websites.
Google’s new Trends for Websites can help you create a lengthy list of relevant sites for link building effortlessly as well as a wealth of useful competitive information.
Barry Schwartz from Search Engine Land, makes a good point that :
Now, if you think like a link builder - you can use this tool to find sites that are within your “neighborhood” or industry. So if I want to find link partners for the Search Engine Roundtable, I enter in seroundtable.com, look at the related sites and ask all of them for links. Then I go to all of those sites and see who is related to them. You can, theoretically, keep expanding that list, as far is it makes sense.
This could change things drastically, personally like the price its FREE. If it is half as good as Google Analytics it will be a very helpful tool for SEO companies.

