The Holga camera was first designed in 1982 by Tokina`in China. The Holga 120S is the origional Holga Model. The 120S features the classic plastic lens, adjustable focus, a fixed shutter speed and 6x6 or 6x6.45 film mask.

The other holga models are:
Holga 120N - Updated version with the same "Japanese" plastic lens, tripod mount, bulb exposure mode, an easier-to-move film counter window switch, and an additional 6x6 film mask.
Purchase a 120N standard Holga from Amazon.com - Click Here
Holga 120FN - A Holga 120N with a flash.
Purchase a 120FN Flash Holga from Amazon.com - Click Here
Holga 120CFN - A Holga 120FN with a color flash!
Purchase a 120CFN Color Flash Holga from Amazon.com - Click Here
Holga 120SF - A standard Holga 120S, with a flash.
Holga 120GN - A Holga 120N with a glass lens.
Holga 120GFN - A Holga 120FN with a glass lens.
Holga 120GCFN - A Holga 120CFN with a glass lens.
HOLGA POLAROID > http://www.amazon.com/Holga-Polaroid-Instant-Film-Films/dp/B000S75K3C/ref=sr_1_26?ie=UTF8&s=electronics&qid=1210058472&sr=8-26
Holga 135BC - A Holga already made for 35mm film, glass lens and the same lens mount of the holgas 120 but with 45mm lens.
Holga 135PC - The pinhole version of the Holga 135 BC.
Holga 135AFX - 38 mm f/3.8 lens with infrared autofocus, automatic film load, built-in pop-up flash and interlock shutter release.
Holga K202 - Meow Kitty camera in the shape of a cat face with blinking lights
source: http://en.wikipedia.org/wiki/Holga#Models