I downloaded the Drake's Fortune pinball yesterday, and for only $4 I sincerely hope that this is serious shades of the future for the PSN/PSP Store.
More high-production-value exclusives at a low cost of entry is the way to go.
The game itself is plenty of fun, It's a pretty straightforward top-down high-res 2D table, it's got a solid playfield layout, and you can play it on the PSP go with the screen in the "down" position (since it only needs the L and R for flippers).
The other tables look pretty great (check out the link), and they all have online scoreboards, so I'm thinking of picking up a few more.
Worth the price of admission if you're a pinball fan and have a PSP with some room on your memory stick.