I use my digital camera's video function, and a Joby gorillapod (tripod).
I don't use a script. I've tried having a short bulleted list open on my monitor (which I face when I've done videos), but I think I do better without it. Instead of a script, I'll do a run-through two or three times, covering anything I think I might want to say (just talking with the camera there, but not recording). By the second or third time, I have a better feel of what I should cover, what I should leave out, how to phrase certain things, etc. It also helps my get any nervousness out of the way, so I don't fidget with the toy as much when I'm actually recording. I agree with Ju!ia that it's good to pretend that you're talking to one person because when people watch, they'll often be watching alone, so you'll come off more personable. ^_^