Well, there's a turnup for the books: Apple has just innovated!
The new OS - Lion, available Summer 2011 - will have better support for full screen apps. And multiple apps can be running that have a screen all to themselves. And you can switch between them.
Only took them 25 years: well done chaps!
(Admittedly, the Mission Control mechanism for switching looks cool, and it appears that there's no menu bar on the apps: they ought to have innovated menus that only appear when you need them
There were some damn good ideas in Workbench...