Google 302 exploit
 

I'd put money on the first person / groups to refine the search engine redirect exploit were adult webmasters:

You silly, silly kids.

http://clsc.net/research/google-302-page-hijack.htm

"Abstract:
An explanation of the page hijack exploit using 302 server redirects. This exploit allows any webmaster to have his own "virtual pages" rank for terms that pages belonging to another webmaster used to rank for. Succesfully employed, this technique will allow the offending webmaster ("the hijacker") to displace the pages of the "target" in the Search Engine Results Pages ("SERPS"), and hence (a) cause search engine traffic to the target website to vanish, and/or (b) further redirect traffic to any other page of choice."