No why would you ask this?
psp lite
the psp
There is no such thing as "DSi Lite" but let me tell you this: at the moment of writing, ALL DS games fit in ALL DS's (DS, DS Lite, DSi, DSi XL)
The DS Lite has sold a lot more than the PSP overall, but it's a matter of what you want, the PSP has much better graphics and controls, but the DS has 2 screens, a touchscreen and is cheaper.
The psp has allot more things to do than the ds lite and more hacking abuility.
For original ds, ds lite, both dsi's psp is better for 3DS kind of a tie
Yes, both will.
that is up to you.I have a ds lite too, and I would do anything for a psp slim, so I would say yes.
Unfortanatly you can NOT do that because the PSP is more then the Nintendo Ds and they are in diffrent companys. Sorry
your choose
Yes, you can use ds lite games in the original Nintendo ds. They are not making new specialized games for the Nintendo ds lite. they are still making games that fit both the original DS and the Nintendo DS Lite.
The game graphics are better. you can go on the internet listen to music download demos and psp themes also wallpapers you can do so much you can imagine except watch videos on the internet and it has no camera. for more info Google psp vs Nintendo ds lite.