Via Darren Chan:
Typetester for web designers
This sweet little web based utility allows you to compare blocks of text in various different forms (italic, bold, regular, etc), showing you how they will look on screen. You can choose from default fonts, Windows safe fonts or Mac safe fonts. Leading, tracking, spacing, size and more, all selectable. After you’ve chosen your preferred style, they give you a nifty option of just downloading the CSS code for it. FANTASTIC!