I came across this review of the Pentax system and it's rather out of date - I wondered if a more informed soul than myself might want to take a stab at updating it?
Not a bad little summary of Pentax gear (although they included Sigma lenses in the mix), although not much emphasis was given to the importance Pentax gave to backward compatibility. So they didn't include older lenses in their blurb.
Keeping prices up to date would be close to impossible, but the major thing that needs updating is the K-7 and newer DA lenses.