The agencies named in the notice include the Department of Justice, the National Intellectual Property Rights Coordination Center, and the Immigration and Customs Enforcement arm of Homeland Security Investigations.
While torrenting in general is one of the seedier parts of the underbelly of the Internet, Torrent-Finder itself did not host or link to any torrents. Instead, it simply acted as a sort of torrent search engine, returning iframes with other sites that do contain torrent links.
If you'd like to see how the site works for yourself, you can check out Torrent-Finder.info, which hasn't apparently popped up on the government's radar yet.
This technicality was apparently not enough to keep the hounds at bay, however. Currently, the site's homepage looks like this:
Most troubling of all, however, are statements made by the owner of Torrent-Finder.com. He told the bloggers at TorrentFreak that his site was seized "without any previous complaint or notice from any court... While I was contacting GoDaddy I noticed the DNS had changed. Godaddy had no idea what was going on and until now they do not understand the situation, and they say it was totally from ICANN.”