Mind Control Comics
As much as anything, the hub of the erotic MC community on the web. Daphne got her start there writing stories, and you can still find them there, including some that have been adapted from movies or made into movies or audiobooks.
The first forum (at least, that we know about) dedicated to erotic MC. Daphne is on staff there.
A somewhat smaller, more intimate forum than the MCForum. Daphne's a regular visitor there.
A forum and gallery of hypnosis and mind control pictures, both originals and photo manipulations.
Voyer maintains a much more exhaustive list of MC resources, of which we are in awe.
A very talented photo manipulation artist with a very literate blog.