In his comment on my Perry Mason post of yesterday, Hunter Baker is absolutely right about the difference between the TV character of Perry Mason and the book version. Original Mason author Erle Stanley Gardner had control over the TV show, so the Perry you see there is the one Gardner wanted to present at that time to a mass audience. However, I think that the Perry of the books—especially during the first couple of decades of the book series—is far more interesting, and I am convinced that the TV movie or miniseries format would be an excellent way to recapture the full effects of the books for a new audience.
It's interesting to consider the A&E Nero Wolfe and Granada Poirot TV series in this regard: neither felt it necessary to go to great efforts to make the central detective character more personable and easy to "relate" to than they were in the books. These great characters are largely as the authors wrote them (allowing for the natural difficulties of translating characters and stories from one medium to another), and the series benefit greatly from these interesting , complex, and often unpredictable central characters.
I think that the Perry Mason TV series' domestication and bourgeoisification of Mason makes the stories far less interesting and effective than the novels were and still are. Given the recent precedents, I believe that a new series of movies could work brilliantly.
It appears to me that this would be an excellent project for A&E, the Hallmark Channel, TNT, or the USA Network—or perhaps even Granada or the BBC—to take up. There are dozens of great stories there just waiting to be retold for a new audience.