On Microsoft's Windows, if you hold the scroll wheel in a browser you get this symbol http://www.plaatjesupload.nl/bekijk/2010/06/09/1276090236-40.png
. It's to scroll fast by moving the mous in the direction you want, the more distance the faster it will move you. I've never seen a thing like this in ubuntu, and i really use this a lot. It could be either browser-only or you could put it in the whole OS wich would be awesome.