MAC= Media Access Control. This is the unique ID number that all networking cards have.
Mac= A computer sold by Apple.
You need to compress the movies into MPG-1 format which as you found out is no longer included as an export option in Quicktime.
Then to make MPGs and other web formats
http://www.discreet.com/products/cleaner/cleaner6/
A much cheaper encoder is ffmpegX ($15)
http://homepage.mac.com/major4/
A free encoder
http://www.biermann.org/philipp/mpegcut/
You do get what you pay for and Cleaner is by far the best but also the most expensive.