what kind of font is this?

[xxxSHARExxx]

what kind of font is use in the "for dummies" book

http://images.amazon.com/images/P/0764506374.01._SCLZZZZZZZ_.jpg

[Santa]

Identifying a font easily (http://www.myfonts.com/WhatTheFont/)

http://digg.com/userimages/projoe/small.jpg (http://digg.com/users/projoe) submitted by projoe (http://digg.com/users/projoe) 55 days ago (via http://www.myfonts.com/WhatThe... (http://www.myfonts.com/WhatTheFont/))
This site will help you identify a font just by uploading an image, if the computer fails to figure it out, then you can submit it to the forums where they will help you out.

[Skiz]

Many fonts such a these are not really fonts at all but illustrations, or drawings. Companies do this alot I've found due to never needed any other letters.

Some people have gone to the trouble of creating some: http://www.sharkshock.com/fonts/fontscom.html