The following suggestions should be considered complementary gifts, not the whole shebang. Good lord, you ARE planning on buying them games, right?
Let's face facts: if you actually spent the money on every game you were interested in buying, you'd be too broke to afford food, and therefore wouldn't live long enough to play 'em. As an alternative, we at the Revolution suggest checking out the rental service Gamefly, which for a monthly fee lets you rent as many games as you can handle without going blind. This isn't some weird cross promotion thing - we actually use the service ourselves and find it unbelievably useful. Hopefully, you and yours will, too.
No, it's not a condom for your games. Well, actually, yeah, it sort of is. These innovative little plastic covers attach to any disc, be it a DVD movie, audio CD or a video game, and effectively protect the data side from being mercilessly scratched by your annoying kid brother. The cool part is that discs run just fine with the D Skins attached, meaning you don't have to swap 'em on and off. And if a skin gets scratched up, you can just replace it with another one, which costs a helluva lot less than replacing, say, a $60 Xbox 360 game. At essentially a buck a pop it's not the cheapest way to go, but since when is insurance cheap?
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1 GB Pro Duo Memory Stick
If you own a PSP and you don't have a 1 GB stick, we have no idea why you own a PSP. It's just the right amount of memory to carry a nice load of music or even some movies (wink wink) in your pocket. Though 2GB sticks are available as well, they currently cost as much as the PSP itself.