Ran into a bit of a bug / feature yesterday when working on spreadsheets... I had 4 workbooks open at once, all with formula that referenced each worksheet. In Mission Control, I could see all of the sheets stacked if they were all open in full or partial windows. The moment that a workbook was minimized, the workbook became invisible to Mission Control. So the only way to then see that the workbook was open and to select it was from the menu bar, going to the window menu, then selecting to activate the sheet's window. If I minimized ALL workbooks, then there was no way to see that ANY sheet was open and active. Mission Control only saw clean desktops and it appeared that there weren't any open / active programs. The only way to see the active sheets was to click on excel in the dock, then go to the menu and select Window, and see the open workbooks. Has anyone else ran across this behavior with any other programs?