I'm getting to be quite interested in Mercuy for psp, looks like a pretty cool puzzle type game.
and they're including the tilt sensor with the game last i heard.
price on psp, it has room to drop, but honestly, you get a lot more with it then when the DS package, so to me it feels like the extra money went into the extra things gotten with the package.
i've yet to hear anyone with a psp complain about batteries and yet to see any real issues with mine. went a couple days using it off and on and didnt get below 50% power. and for me thats using a handheld a lot. so i have no worries about future battery problems either.