I've owned a Pre since day one, so I've seen too many cards more than once, but today I got my first "Too many cards" prompt on the TouchPad. Seriously HP? You spent how much time on this and we still have this problem? I only had 5 cards open, and still got the error after closing them all. I had to restart the device.
This is why webOS will ultimately fail - because you're incompetent. Maybe you should have spent time fixing bugs instead of writing easter eggs.