Ok, the spammers have resorted to a new redirector. They are now leveraging AOL to do their dirty work.

Below is an example:
http://r.aol.com/cgi/redir?http://www.example.com/

Any URL a person likes can be placed after this and it will cause that site to load using the AOL site as a redirector. This allows for a filtering bypass e.g URIBLs will see AOL, not the spammers site placed at the end.