[email protected] for the removal of threads. They will remove threads but it may be up to a week later.
BUT BEFORE YOU KILL THE THREAD...
Be sure to kill the files on whatever filehost they are on, ie. Rapidshare, Netload, Hotfile, etc.
The reason being is that most of the pornbb uploaders mirror those posts on several other forums. Killing the pornbb.org thread but leaving the files alive won't really do that much good.