http://www.fontshop.com/blog/newsletters/pdf/webfontfontuserguide.pdf

FontShop’s take on it:  For nearly 15 years, web designers had two frustrating choices when it came to type on the web: use one of the few “web safe”fonts preinstalled on major operating systems, or substitute text with images and Flash/JavaScript ® hacks.  Not anymore. Recent developments in web standards (using the @font-face CSS declaration) and font formats make it possible to render  HTML text in typefaces other than the same old default fonts. Today, FSI FontShop ® International is leading the charge to offer fonts designed specifically for web use. More than 30 of the most successful FontFont families are now available as  Web FontFonts ®, including  FF DIN ®,  FF Meta ®,  FF Dax ®, and  FF Kievit ®.