EVP could be considered a part of ITC. As could spirit photography -- depending on how it's used.
Yesterday I made my first attempt using a video feedback loop. The idea is to point your video camera at a television that is broadcasting what the camera is recording. The screen shows some wild feedback images. I then go through the video frame-by-frame to look for any sign of images/contact.
I didn't see anything that looked really obvious, but there were some interesting patterns and shapes that stuck out. Here's one frame of my experiment:

Has anyone else experimented with ITC?