Thanks for the info guys.
@Sama7 I am probably one of that last people on the planet that doesn't own Photoshop (or Fireworks), but your post helped me figure out how to do it in Gimp. I had scanned the menus many times looking for "splitter", etc, but after I read your post I looked again and found the "Slice" option. So basically it appears that I can do the same thing with Gimp; setup the guides and then use the Slice tool to cutup and save the individual pieces.
Unfortunately it appears that although Gimp has great grid maker, the slice tool only uses the guides...if it instead could be made to use the grid lines, it would make slicing up spritesheets even easier. But the guides are not too bad as Gimp allows easier creation of guides by clicking on the top and side rulers and dragging down (or sideways). Still a PITA, and alot more work than making a quick grid (or running a splitter by specifying an offset and tile dimensions), but it sure beats individual cut and pastes.
If you ever do write that utility for splitting automagically, please send me a PM as I would still find it very useful. As I said previously, there are several splitter utilities on the web, but most lose the transparency channel, so I think a good splitter that handles transparency would be great.
Best Regards,
Q