I'm always amazed at how some people see the name of a technology (the meaning of which they don't know and don't care about), and they somehow think that it would solve all the problems with a product that they have.

OK.
In short words, V-Sync is a simple technique that makes the video card in your PC only render as many frames per second as your display can refresh itself.

By the way, I don't have any problems with scrolling on the N900's browser. It's a little annoying when you have to wait a second for it to render the area you've scrolled to, but it is still enjoyable for a mobile device.