The ability to record just a certain portion of the screen (what Screenium call a "Fixed Area"). When we use Screenium it is generally to record training videos on how to use our software product, this lets us optimally size our software window, and then capture it and nothing else so there are no extraneous distractions in the finished video.

I bought Screenium a few years ago as part of updating my classroom material. It was fairly cheap and did what it is supposed to do: capture movie to show what you do on screen. Good basic feature set: full screen, dedicated screen section or follow cursor. Recording is smooth and quick. Price is fine and the software works intuitively. There are occasional updates, but overall, the product seems stable and mature. The concept of a media folder from which you can control all capture is OK, but not as scaleable in the end. I had to remove most capture (or transfer them to a backup) as they took too much storage space and cluttered the interface.

Screenium is by far the best software (for the Mac) for taking screenshots as well as making video tutorials or other video types for later review.