Ouch, looks like we hit a raw spot with Jann. I promise that it wasn't intentional! We can still cure you of that nasty "C***n" infection that you're stricken with.
Pentax has some "Limited" lenses which are their top-line ones, comparable or better to the Canon "L" glass. Nearly all their primes are generally considered some of the finest optically out there, and Pentax does make a professional camera - a medium-format film one. (What "true" pro would be caught dead with a mere 35mm or small-sensor DSLR?

) Their medium-format DSLR is announced and coming - but of course, that's going for a different market than the $1,500-2,000 "pro" DSLRs.
You can also find any number of superb older Pentax-mount lenses for sale on eBay - but you'll pay a lot more today than you would have two years ago!
My point was IS in the body vs IS in the lens. You'll probably pay at least 2x as much for an IS lens vs the same lens without IS and I'm not convinced that in the real world, one system has got any real big advantage over the other in terms of functionality. (On paper, in-lens wins at long zooms - but in the real world, they both seem to work pretty well from what I've read.) I think IS in the body is a much better option for the average consumer.
I have also said that I think it's only a matter of time until Canon and Nikon begin offering IS in the body, especially as they implement dust-removal - shaking the lens to remove dust is one step closer to shaking the lens to stabilize it. When they do, the player field will be leveled... until then, I think the average photographer who spends $1,000-$1,500 on a system with body and lenses will have a system with more functionality with Pentax than with the competition. Heck, for somewhere around $700-750, you could have a K100D and two lenses (18-55mm and 50-200mm), both image stabilized. For less than $1,000, you can add a 50mm 1.4 - also image stabilized, not even an option on the C/N line-up.
Once C/N add IS to the body, all bets are off again - since they are all great cameras and can produce superb image quality. I think Pentax will continue to do well due to "trying harder", look at all the new things in the K10D, versus what's been new in most of the competitor's latest introductions.
One last word on "pros", plenty of "pros" use Pentax. Just recently, a newspaper reporter posted on Steve's about one of his photos (taken with the lowly *ist DL like mine) being published in the New York Times, to accompany a story that happened in his town. "Pro" just means being paid, and not all "pros" need 5fps capture, 22mp, or weathersealing. A food photographer will have different needs than a sports photographer, who'll have different needs than a wildlife photographer, who'll have different needs than a landscape photographer, etc, etc.