(Being an elucidation for the benefit of Mr Coates.)
Jason Kottke proposed a retooling of Cmd-Tab and Exposé. I don't like it.
Windows has one class of item; the window. (Actually, Windows is really confused about this, especially if you run Office, but let's imagine all you're running is IE.) In the taskbar, you get a list of all the windows. Alt+tab swaps between each of these windows, so to get from IE to Notepad (again, assume it's the only other app open) could take three taps of tab, or one, or two.
Both the Mac OS and Mac OS X work on a different principle. There's an application, and there are windows belonging to an application. Apps show in the dock, and in the cmd+tab switcher (be it the Dock, or LiteSwitch, or LiteSwitch X) you swap between running apps. (Since 10.2, you've been able to swap between windows within an app with cmd+~, a handy but badly documented addition.)
Exposé maintains this distinction. Hit F9 to go to All Windows mode, then hit tab. You'll swap instead to F10 mode, with all the windows of the current application highlighted and other windows shaded in the background. Further tabs (or taps on ~, which moves backward) change the seleted apps, not the window.
Edit: Tom noted that tab moves to the next app that the cmd+tab switcher would move to, not the current app. Thanks and sorry.
My reason for disliking Kottke's proposal - and being a little rude - is that I question whether he understands the reasons for maintaining this distinction; a distinction I find central to the way I use a computer, and one of the reasons I don't like using various Linux desktop managers, or Windows. His proposal carelessly discards it, so I'd no longer be able to swap between my ten BBEdit windows and ten Safari windows with one key combination; depending on the implementation, I'd either have to tab past all my Safari windows to get to BBEdit, or watch them flip past in z-order, with Safari and BBEdit interleaved.
(Add in the fact that I usually have open not the usual five windows of an Office using worker, but at least ten apps with between two and fifteen windows each, and you're looking at a long slog to find stuff. In fact, it's amazing how many apps Mac OS lets you juggle, compared to the limit that the Windows taskbar feels like it's making. But I digress.)
How would I solve these problems instead? Either an additional key in Expose's rotating view (although the arrow keys already let you choose any window), or global support for window palettes (like BBEdit offers, and Pith adds to Safari) would be preferable to me.
For what it's worth, there's potentially some value in adding the cmd+tab overlay to Expose in F10 mode, so that you'd know which app was next. However, it'd probably also confuse people, and maybe look a bit ropey, especially with Panther's full-screen-width command-tab implementation.
I'm not entirely against change - I've even finally embraced the few new features in Mac OS X's Finder. I don't like it when it's badly though out and breaks a fundamental way of thinking, though.