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Type Navigator
This is an amazing site that is perfect for new designers. Are you searching for a typeface that looks a certain way, but don't know how to find it? This site helps you find the perfect typeface by using a simple, visual interface.
typenav.fontshop.com
These websites are great tools for web designers who are constantly searching for the perfect screen type. These sites allow you to compare several fonts side-by-side.
typetester.org
fonttester.com
typechart.com
Don't want to use any of the standard screen typefaces? This website will help you choose from a 1,000 possible faces that you can embed in your code, they'll even tell you how.
fontburner.com
typekit.com
Fontifier
Do you love your handwriting, or like to design your own typefaces? This service will create the digital files you need to use a customized font. It doesn't give you the best kerning tables, so you'll need to hand-kern...but what do you expect for $9?
fontifier.com
FontStruct
This free software allows you to try your hand at type design. It allows you to design your own typeface through an intuitive interface.
fontstruct.fontshop.com
Often you will find an existing typeface that would be perfect for your project, but you don't know where to find it or what it is called. These websites will help you identify a typeface from a scan or screen shot.
new.myfonts.com
linotype.com/fontidentifier
identifont.com