Neocrisis: It saddens me to see a great concept implemented so poorly. In this case, Sony had a real awesome idea on their hands, but fell flat on their faces trying to implement it.
For the uninformed, here's the lowdown: the PSP Go is an alternative to the regular PSP3000. Sony is promoting a dual platform, so that the two can live on the shelves in harmony, and thus the PSP Go isn't necessarily better than the PSP, just different. Besides the form factor, it differs from the regular PSP by swapping out the UMD drive for 16GB of flash memory, and Bluetooth. The lack of the UMD drive makes it lighter, and probably smaller as well.