Well, the NDS has less graphical capabilities, but it has a touch screen and mic built in, it uses flash carts which willprobably be able to store around 128-256mb or so of data. The PSP uses 1.5gb discs for data, and memmory sticks to save things etc. Because if the power requirements for the PSP,you will get 2.5 - 4 hours on the PSP's battery before you need to rechard. The NDS has a 6 - 10 hour battery life. Game wise, Nintendo has quite a few interesting games lined up that should push the use of the NDS to its potential, while the PSP will have more big titles like Metal Gear Solid. Though, with the extra stuff added to the PSP it could really mess with its capabilities, so overall it looks like the NDS will be more capable of being enjoyable, the games looking to have a lot of replay value and based on just being fun, rather than the PSP being a sister to the PS2 and PS1 game wise, and after a few plays of the games you could easily get bored of them. Also, many of the PSP games look as if multiplayer may just be thrown in to aid in the sells. The NDS is being built around being able to interconenct with other NDS systems, so playing with friends will be even more entertaining than on the PSP