Arri: Digital Fact Book →
I just found out that Arri has an online digital glossary on digital video. Crazy useful! Go check it out.
Some Basics On Digital Video Files →
Do different video codecs and compressions scare you? Check out this starter guide on Digital Photography Review and see if that clears up some basics.
Zeiss Book →
Film and Digital Times has updated their book (over 140 pages) on the company Zeiss who make great cinema lenses. Check it out if you have the time.
Anamorphic Lenses And DSLRs →
A good starting point for anyone interested in anamorphic lenses and DSLR video.