How about a page where one can find lists of reviews for Pentax cameras and usable lenses?
For example:
Pentax K100D
DCResource
http://www.dcresource.com/reviews/pentax/k100d-review/index.shtml
CNET
http://asia.cnet.com/reviews/digitalcameras/0,39005881,39259740p,00.htm Sigma 10-20
Photodo
http://www.photodo.com/topic_30.html Sigma 17-70
Photodo
http://www.photodo.com/topic_65.html
.....
This would most likely be a page maintained by the site admin/mods with a forum where members could post new links to camera/lens threads.
Or, if the site software does not support separate pages, then a forum for review links only. Limit one "product" to each thread and then people could post links to that thread.
(I spent a lot of time Googling for info when making my decisions. Life could/should be easier.)