Wikipedia lists the 6502 as having between 1 MHz to 2 MHz and the Samsung Galaxy SII as having around 1.2 GHz.[0] I'm guessing that's where the 1000x comes from... Or, you know, it's just a nice big number. ;P
[0] Of course, that's ignoring multiple cores, better microcode, caches, etc.
[0] Of course, that's ignoring multiple cores, better microcode, caches, etc.