With Sony recently announcing the UMD-less PSP Go, this announcement should come as no real surprise, but the company's social media manager Jeff Rubenstein has confirmed that "just about" every PSP game released in physical format after October 1 will also be available for download on the PlayStation Network. This coincides with the launch date for the PSP Go, which will include 16GB of internal storage, along with expandable memory via a Memory Stick Duo slot.
Additionally, Sony intends to make upgrading to the PSP Go more viable for those with large UMD collections by implementing some sort of good-will program, but those plans have yet to be detailed in any significant way. It'll still be up to third-party publishers whether or not they want to release past and future titles on the PlayStation Network, but I imagine most - if not all - of them will just get with the program. Currently, the company has only about 35 UMD titles available for download via PSN, ranging from $5.99 to $24.99.