For something different I though I would post about a fog machine I used a couple of years ago.
A PDF of the unit can be found here: http://www.mole.com/rentals/catalog_sheets/1963.pdf
There are 2 nice things about the fogger made by Mole Richardson. First, once it is heated up you can disconnect the unit from its cord and move it to where ever you want to disperse the fog. Second, it's essentially adapted from a pesticide fogger, so the unit will spray other things than fog like fog chaser or room deodorizer. I haven't used these features, but I could see how dispersing a fog effect could be useful.
Mole also produces a few other effects and a range of lighting equipment, including a few unique pieces like a Molegator grip: http://www.mole.com/rentals/catalog_sheets/4023.pdf, and a molevator: http://www.mole.com/rentals/catalog_sheets/325.pdf. they also have a nice variety of stands.