I make a note with this, since I have not heard of this before, and it may be relevant to more cameras than just the Pentax K-x.
It is very fast, almost five frames per second. The pro Canon 5D does not even have that.
But there was an oddity, it stopped after just three frames in Continuous Shooting mode! That's less handy.
So I googled for a Pentax K-x forum, and the closest thing seemed to the DPreview Pentax page, so I asked there. (It's a good place to get help for any brand.) And I got advised to turn of the Image Correction features, which correct distortion and/or color fringing in-camera.
And that did it, now the camera just rippppps away. Cool, in such a small camera. (Not that I often use continuous mode, but it's handy when shooting action.)
By the way, does anybody know how I can order one of those really colorful copies? (Also featured on tOP.) (Style simulator page.) (The page is slow to load, and has continual music, something I think should never have been allowed on the WWW, but fortunately you can turn it off on the right.)
Update: thanks to Mike Johnston and Dirk for pointing me here.