The RIAA just lost a lawsuit recently against a woman for pirating music. They lost on the premise that she uses a wireless network at home the she never bothered to secure. Therefore, anyone could have gotten onto her network and shared pirated music through her IP address making it hard to prove that she was the one committing the felony.
Test:
I did a comparison a month ago between starting a new site using a newly registered domain name and using a domain registered two years ago but never had content except for a Godaddy default parked domain page. All pages and content were the same across both sites. They were both submitted to Google in the same manner. The only difference was the domain names of the two sites.
Result:
The site using the pre-existing domain name got indexed after one month while the site using the newly registered domain is still not indexed by Google.
Explanation:
It could be that the default Godaddy page was indexed by Google therefore their crawlers are already scheduled to crawl the existing domain while the newly registered domain just get placed into a queue when it was submitted to Google. At any rate, if you are thinking about starting a new website, it would be worth your while to look through any of the existing domains you have registered before going to a registrar to get a new domain name.