Hmm, Tegra seems virtually identical to Apple A4
Although the Tegra 2 can come in dual core versions - apart from that, the ARM core and OpenGL 2.1/Direct X 10 graphics hardware is pretty much what Apple packs into an A4. Just saying.....
I have been wondering when a pointy clicky 'Unlock my iPhone/iPad and put Android on it' distribution would appear? There is a lot of legacy Apple kit out there now to target for 'upgrade' to Android.