Meet Itching Thumb, an absolutely amazing task switcher that's very similar to the one found on WebOS. There's not much I can say that rivals what's shown in the video:
For those who are unable to watch the video or who are unfamiliar with WebOS, it's basically a "card" system - similar to CoverFlow (but with a customizable style). These screencaps illustrate what I'm talking about fairly well:
Left: the cards are flat as you scroll; you can drag an app to the top of the screen to close it (shown). Right: the cards angle out, as in CoverFlow.
There's a surprising amount of customization, especially considering that the app is still in beta (the most recent version is 0.7). There really is just too much to this app to be described in such a short post - which, again, is why the video is so essential.
Unfortunately (for me), I can't get this running properly on my EVO running CM6 nightly 131. I'm not sure if it's because of the weird custom theme I'm running or because of having ADW, LauncherPro, and CM6 all installed and running a ton of custom (and sometimes conflicting) settings. Just had to reboot my phone! Regardless, this is still an incredibly cool task switcher and packs some serious eye candy - and once I get my launcher and settings sorted out, I'm definitely going to run this app.
Itching Thumb is free and can be found in the market or on AppBrain. Alternatively, you can scan the QR code below: