Anybody used this program http://www.tawbaware.com/imgstack.htm looks interesting for night scape landscape shots , havent tried it for astro stacking but hopefully it works easier then photoshop ....its free to
quote "Distribution Status. Image Stacker is distributed as shareware, meaning you are expected to "register" it (i.e. pay $17) to purchase the program. While Image Stacker will operate without registration, it is limited to processing 10 images with sizes no larger than 640x480 pixels. Image Stacker comes with no warranty and TawbaWare and the author take no responsibility for any damages caused by the use of this program. "
Sounds like it is very much crippleware! for DSLRs I think it would be very much underdone, and especially those toucam people out there will be not happy, only 10 images max.!