Palm Pre "Cards" Deja Viewed in Mobile Safari "Tabs"
We've mentioned this in passing before, but the parallels, if any, are worth making more prominent.
While the iPhone doesn't keep them live or let you re-arrange them, and has an X to close rather than the throw-away gesture, going as far back as two years ago when Steve Jobs introduced it at Macworld 2007, it let you zoom out of the Mobile Safari web browser with an eerily similar thumbnail representation. (Though there doesn't seem to be any patent contention over that just yet...)
Actually, given Apple's recent obsession with Cover Flow in iTunes, OS X 10.5 Leopard's Finder and now Safari 4 Beta, we're surprised they didn't just default to that for Mobile Safari tabs from the get go as well...