Hey Marko.
I used to really enjoy using Amcap. It comes free with the Celestron NexImage webcam. I thought it was actually better than the camera itself!
Haven't used it since I sold the NexImage ages ago, but since you've pointed out it works with the ToUcam I might download it and give it a try.
Paul - Craterlet looks quite good. Nice-looking interface. Looks like an Apple prog. I'll give it a go too.