Magic Lantern
Professional features on a large range of EOS cameras. Most of this is tailored for the EOS-M (because I own a few). However these techniques will apply to the other cameras.
Videos:
more to come ;)
Articles:
- HDR video, and dual ISO raw.
- Raw video.
Just incase the eos-m nightly build ever breaks, below is a version I have used in my videos.