My own 'ScreenGrabber' application works in a similar way to 'Glimpse', except that:
1) It should be faster (it uses SWIs rather than OSCLI).
2) It will always save the whole screen, not just the current graphics window.
3) It is more configurable - for example you can choose whether or not to include a palette with the sprite.
4) It comes with an easy to use desktop front-end.
5) It is compatible with the Iyonix PC.
If anyone is interested, it can be found at [link]