With all of the problems associated with contact forms and the new WP 3.0 version, I wanted to recommend a very excellent form. I've installed 2 of them, and they work excellently. Easy to install and use and can add customized fields. Up to 4 different forms are allowed. Great product.
And I also recommend sending a donation to this developer for his efforts, Mike Challis. It's a big package, and he's done a very professional job!!!