Glad to see there is a section on TV.com for these great movies. While I wish there were more, I guess the limited number keeps them fresh and turning Jesse Stone into a longer series might reduce the quality of the stories. Tom Selleck would not have been my first choice to play Jesse Stone, but he's excellent - so much so that when I read the new novels, he is who I envision as Jesse.
The first three movies are all either out or coming soon to DVD, and I hope that the recent Sea Change comes out too. Even though some of the movies (especially Sea Change) differ from their source novels, they succeed in capturing the spirit of the books, and especially Robert B. Parker's dialogue and characters.
There are still two novels (Trouble in Paradise and High Profile) that have not been turned into movies, but Tom Selleck recently stated that there will be (at least) a fifth Jesse Stone movie. In fact, he even negotiated his contract with NBC's Las Vegas to grant him time off to shoot the movie!