I could have sworn I wrote a response to this!

Anyways, here goes for the second time

Yes this is a very good point (re: 4 finger swipe).

I actually like the way that Honeycomb does app switching over the playbook, though it could be done a little more stylishly. Both systems require at least 2 finger presses to get to the application. In the case of swiping left and right, this count can increase past 2.

I think that HC should have a single click of the app-swticher button, and then perhaps zoom out all windows so that you can select among those that were previously running. The zoom prevents this from being confusing as the user can see that their current window is now a part of many running windows, and re-select it, or select something else.

Again, I prefer the mechanism that Honeycomb uses (to the playbook), though the way its drawn on the screen could be much, much better.

I don't care so much about live windows either, I think it's a waste of resources and battery life. I much prefer the way Android does multitasking as it allows the developer choice over what happens when the app loses focus, and eliminates the need for the user to explicity 'close' an application (similar to palm OS of old).