(There's no video for ASM (Application Switcher Menu) yet. Please contribute to MR and add a video now!)
ASM brings back the application switcher menu (and more) to Mac OS X. It's highly customizable and offers some nice extra features, such as Classic Window Mode (orders all windows of an application to front when it becomes active) or Single Application Mode (automatically hides applications other than the front-most one).
If you are so inclined there is an interview with the developer on ATPM.
asm-2-3.dmg.sit (857.44 KiB / 878.02 KB)
Version 2.3: Requires Mac OS X 10.5 - 10.6 / compressed w/ Stuffit
asm-2-2-12.dmg.sit (855.94 KiB / 876.49 KB)
Version 2.2.12: Requires Mac OS X 10.3 - 10.5 / compressed w/ Stuffit
** dock sub menu feature not supported under 10.6
Emulating this? It should run fine under: SheepShaver