I lurk on assorted Pentax fora, and found that Pentax have launched a dedicated gallery with images taken by pros and enthusiasts. Regardless of the equipment used, I found it to be a great site for drawing inspiration from.
It can be found here.
http://www.pentaxphotogallery.com/ho...=0&language=EN
Plenty of language options too for non-English speakers, very nice slick interface to the whole site.
One of my favourites was this one:
http://www.pentaxphotogallery.com/ho...=0&language=EN
Oh, and this is very, very beautiful too:
http://www.pentaxphotogallery.com/ho...=0&language=EN
I think Darren Melrose's work is fantastic, he can really convey atmosphere in his street portraits.
http://www.pentaxphotogallery.com/ho...=0&language=EN