Originally posted by justtakingpics What does it mean "You can bracket 5 shots"?
"Exposure bracketing" is what Pentax calls it - p. 109 in the K-x manual. The camera takes three shots: a normal exposure, an underexposed shot and an overexposed one. You can change the amount of under- and over-exposure, the order of the shots, and other details. It's useful for everything from quickly getting several exposures to choose from later, to HDR.
The K20D is like your K-x, limited to 3 shots. The K-7 can do 5. That's overkill for most purposes, but it allows a little extra flexibility. Combined with 5.2 fps, it can take all the shots very quickly. With only 3 shots, you can change the exposure compensation, take three, then change Ev comp. and take three more. Not a big deal.