From a MKDS FAQ:

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Help with power-sliding (aka snaking)

When you begin your powerslide around a turn make sure you turn yourself sharp

enough for the turn FIRST and then begin your left and right tapping.

I find that if you're turning LEFT you should be holding RIGHT while sliding.

So begin your turn by turning sharp enough to the left that if you slide to

the right you won't go off the course at all. (Going of the course will slow

you down so much you'll wish you didnt slide at all in the first place, so

avoid this like the plague.) It's very important that you keep your kart

moving in the same direction as the course when using these boosts, so on

sharper turns, a lil jump right AFTER the boost can help you straighten

yourself out immensely. Also on the sharpest turns make sure you jump a few

times BEFORE you slide to get yourself in sync w/the direction of the course.

(Most people that slide off the course here and there and dont understand why

probably dont do this)

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Black already looked awesome on the PS2, so can't wait for #2. As long as they've put in a 'jump' button. I hated it that you couldn't jump in Black.

The PS3 sucks...

and you know this because you've played it extensively.