This article is in the early stages.
In the past and we still do this to some degree today....
Recommend Hosted Solutions
FontSpring
FontSpring is preferred because they provide formats to work with older browsers http://www.fontspring.com/fontface and have auto-hinting to ensure the font looks nice on Windows.
Even though web fonts are quite prolific, some custom IE6 installs at some banks may break web fonts. Fontspring works with IE6.
To document, there's a flash as the font changes... what browsers and how that happens.
FontSHOP
FontSHOP has a very large selection. At the moment they seem to be larger than FontSpring.