I'm banned on Freenode's IRC emacs channel since about 2006-10, and the ban was never lifted as of 2009-03. The ban is primarily, and single-handedly executed by John Sullivan (aka johnsu01).
I started to use freenode's IRC emacs channel in about 2005-12. I was banned in that channel on and off before 2006-10, and the regulars on that channel discussed the issue on a emacs wiki (emacswiki.org). But few months after the permanent ban by John Sullivan, the entire page is removed. I have saved it, and the complete saved page, unedited, is here: Kickban Xah Lee From Emacs Channel. The above contain image links to other sites, which may be gone. Here's a archived version: EmacsWiki_KickbanXahLee.zip.
I was also ban'd in freenode's lisp channel a few times. See: Ignorance And Intolerance In Online Computing Communities.