GamesIndustry.biz has some more news on the Playstation Store, thats expected to open for PSP downloads in 2008.

At the moment it looks like there will be seven PSP game titles on offer initially, all weighing in at around 30-50% of the size of a standard UMD game. Prices are not yet available for these games.

Sony will offer multiple content to PSP users via the PlayStation Store, including original games, classic PSone titles, demos for UMD-based and downloadable games, additional content for released games and TV content such as trailers, behind-the-scenes clips and interviews.

A source close to SCEA has revealed that three action games, two music-based games, one racing title and a shooting game are being developed internally.

Downloadable games for the handheld will be between one half and one third of the size of the average UMD title, offering between two and ten hours of gameplay.

This means that games are not going to be available (at least initially) from the Playstation Store that you would normally pick up from your local game retailer, i.e. these games are being written specifically to sell online.

Sony is currently courting third-party PSP publishers for the PlayStation Store, which offers a better return on investment for the publisher and format holder as it completely cuts out retail partners.

As well as the new PSP titles in development, SCEA will also be offering 13 classic PSone games for the handheld during 2008, all of which are currently available on the PS3 service.

PSP content can be accessed, purchased and downloaded from the users’ local PlayStation Store to the handheld via a wireless hotspot.

It can also be accessed by a PlayStation Network account on a PC with a USB cable, but no content will be stored on the PC.

The interesting thing to note here is that no content will be stored on the PC, meaning that the game will only reside on your memory stick until you delete it. There is no word as yet on the ability to back the game up, or if you will be allowed to download the game again for free.

It will be interesting to see if there is a block on custom firmware users downloading content from the Playstation Store, and whether the games can be backed up manually to a PC harddisk.