The PSP Go is disaster on many levels. Pricing, nickel and diming with accessories not compatible with your older PSP, and Sony still hasn't put in place a system to legally transfer your UMD library to the PSP Go without double dipping. I was honestly interested in the system, but Sony has definitely mishandled this iteration of the PSP, especially for fans of the previous model.
However, one positive of the Go is the inclusion of PSP titles available for download on PSN. The American store is missing some key titles such as the Lumines games, MGS:PO, and Crisis Core, but the there's a wider selection of content now, especially with the fact that all new PSP games must now be available on PSN as well.
Are you gonna start buying PSP games of the PSN store, or are you gonna stick to UMD, which give can be resold or traded?