Snapz Pro X is one of the most popular applications available for screen capture on the Mac, helping you quickly record both still images and movies of anything that happens on your screen. This app gives you a lot of flexibility for image and video capture, allowing you to select certain objects, an area or window, or your entire screen--and you can automatically save the capture in various formats, with extra settings like watermarking, color depth, scaling, and frame and data rate. A live preview also lets you tinker with screenshots before saving them. Recent updates have added support for Snow Leopard, a safeguard that stops movie captures if a disk is nearly full, and several other fixes.
Since Snapz Pro X's introduction, other third-party apps (and even OS X itself) have begun to offer more capture functionality, so make sure that you check out all your options. Overall, though, Snapz Pro X is still one of the most full-featured and easy-to-use packages available. We look forward to its next major update.