On the webpage for the Playstation Store Online in Asia, Sony has an interesting question for gamers: 

The store in question is for their PC store, letting you download games and programs to your computer before transferring them over to the PSP/PS3. This wouldn't translate to a charge for the actual store itself - only the unlimited download option.

This would probably be a one time cost for unlimited downloads, an interesting prospect. Not unlike Gametap and the amazing Sega Channel, being able to pay a monthly fee for unlimited plays is a great way to lure people in.

I would consider the cost if there was more to buy, but seeing as there isn’t much there yet and are asking upwards of $50 a month in this poll I might step out. Hopefully the cost drops and there is more to download in the near future – or they drop the idea entirely.