Sony plans to make "just about" every PSP UMD game released after October 1 (the PSP Go launch) available for download via PSN.
Speaking on the US PS Blog, Sony man Jeff Rubenstein said: "It's my understanding that just about everything hitting after October 1 will be available for download."
He did however insinuate that that the availability of third-party titles will be decided by the publisher/developer.
The release of the PSP Go, which only plays downloaded games due to its lack of a UMD drive, will mark the start of Sony's PSN onslaught, having previously said it will make some currently released UMD games available over the service, along with a flurry of PSone titles this year.