Link Popularity Tool
Do not purchase a new domain unless you have to. Due to Googles aging delay for all new domains, your best bet is to use your existing domain/website if at all possible.
The Link Popularity tool displays the total number of backlinks from the most popular search engines. Google, MSN and Yahoo results are returned when you type in your website URL.
backlinks - [ bak lingks ]
1. "Backlinks are incoming links to a website or web page. The number of backlinks is an indication of the popularity or importance of that website or page. In basic link terminology, a backlink is any link received by a website from another website. Backlinks are also called incoming links, inbound links, inlinks, and inward links." -- wikipedia.org