The Pentax
screwmount lenses are certainly usable on your K-x, and some (like the 50/1.4) even provide exceptional image quality at a really low price.
You'll want to get the
M42 to K adapter from Pentax (or you can get a
cheapo one, but it won't allow you to focus to infinity).
As far as using the lenses goes, it's pretty much the same as M and K lenses. See
here for info on M and K lenses.
Finally, I've written an article on
manual metering, which you might be interested in checking out. Hope this helps!
Adam
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