Controling Fonts

Howdy,

Im just curious on what font families/settings is the generaly accepted and used for web pages and the best way to go about using them, at the minute, from playing around and experimenting, I am using {Verdana, Arial, Helvetica, sans-serif;} set at 90% in the external css {body} and I am controlling the sizes by using ems with a line height set to 120%. is this a good thing or would you recommend otherwise.

Here's a good guide

http://www.ampsoft.net/webdesign-l/WindowsMacFonts.html