If you have Photoshop, or Photoshop Elements, most of the later versions have a 'Save For Web' function that can convert a series of images into GIF format, and save the stack as an animated, web-viewable GIF.
Other alternatives include Windows Media Manager or iMovie (Mac OS X) to create a time-lapse sequence of JPEG images that blend together (can be done a variety of ways) to create an AVI, WMV, or MOV file (depending on your tool/app and OS).
CGEM 800 HD, NexGuide, Orion XT8 Limited Edition, Oberwerk BT-100, Canon 20D/20Da/T3i/60D/5D Mk III, various eyepieces, adapters, geegaws, widgets, and tiddlybits