Malware Search engine provides a Web interface that allows anyone to enter the name of a known virus or Trojan and find Google results for Web sites hosting malicious executables.

The release of the search engine was motivated in part by a recent announcement by Websense Security Labs, of San Diego-based Websense, that it was using the freely available Google SOAP (Simple Object Access Protocol) Search API to find dangerous .exe files sitting on Web servers.

http://metasploit.com/research/misc/mwsearch/

Cheers
pavs