Not sure if this has been mentioned here but this guy from dpreview seems to have gotten a few Nikon lenses to fit on his Pentax. Anyone has tried this before? If it works, then the range available to Pentaxians have increased! I very much doubt the contacts are the same , so manual focus probably...
http://forums.dpreview.com/forums/read.asp?forum=1036&message=19738793
http://forums.dpreview.com/forums/read.asp?forum=1036&message=19738793