Well there is also the Samsung Hummingbird (Almost the same like apple's A4)
It's like the TI OMAP 4 series @ 1 GHz plus and with a PowerVR graphics core like the OMAP 3 and 4 series (though a better/faster core at that).
It's used in the Samsung Galaxy S which is Android and in Apple's Ipad and Iphone 4 (though in slightly different form so apple can claim it's custom).