I recently joined a local photo club, and last night was the first meeting I have been to. I wasn't at all surprised that I was the only one with a Pentax camera, and that 3/4 of the people had D3, D300 or D200, or that the other 1/4 shot big fat expensive Canons.
I had a chance to try out their equipment, and the class was on studio lighting. Part of the workshop was on Nikon speedlites, so I was able to watch these guys in action. What I found amusing was that half these people weren't sure how to set their sensitivity, or even what it was. A few of the more experienced guys were blown away that Pentax flashes had wireless capability, and some even a little jealous to learn that the baby FGZ 360 could not only be controlled by the other flashes, but could also control others (Nikon SB 800's can control other speedlites, but SB 600's can only act as slaves).
I also noticed after using the Nikons that my K10D was lighter, and imo 100 times more logically laid out. The newer cameras had impressive ISO performance... but so does the new K20D. The nicer HSM lenses were fast and quiet, but with the expanding Pentax DA* line, nothing we can't compete with. Speedlites can be set to different channels and their output controlled from the camera site... but the Pentax flashes could be as well if Pentax decides they want to build a controller similar to the Nikon one (and I don't see controlling output on the flash as that great a burden anyways).
Overall, I walked away more happy than ever with my purchase. Lighter, more intuitive design, and so very much more for your money. No matter how you slice it, with Pentax, the numbers are in your favor.