Hi Rober, and welcome to PR and the Pentax forum. This forum is for all things Pentax and K-mount related. Some of the photographers here use the K200 and K100, so they should be able to help you with most of your questions. If we can't, we can usually find out from someone who knows more than we do.
As for a "specific" thread, there really isn't one that I remember or can find right offhand. But, if you want to start one, that would be very acceptable.
After you have used your camera for a few weeks and begin getting comfortable with it, please post your review here or you can use this link: http://www.photographyreview.com/writeareviewcrx.aspx . Reviews are what helps keep this site free and your experience can help someone in the future make an informed decision.
Please let us know when the camera arrives and let us know what we can do to help you get up to speed on it. Have fun and happy photographing.
Ken