well, i am a pentaxian, i?ve got the kx. one thing that you?ll have to get used to when using pentax is that a lot of canon/nikon guys will not take you seriously, especially if you use the extraordinaire prime lenses. pentax tends to build its products smaller than most other producers, and most people think that a small lens means crappy lens. one thing that i also love is that you can use all their old, manual lenses on the new bodies, an A50/1.7 costs literally nothing and is such an awesome lens to play with total manual controls.
anyway, i usually try to avoid talking like that. go to pentaxforums.com if you want to inform yourself about that great camera and pentax lenses, people there are very helpful.
last words: make up your own mind about pentax, if everyone would be buying the 2 market-leaders, people wouldnt be driving that many different cars, would they?