Google Font API allows makers of web pages to use non-standard web fonts to apparently 'make the web beautiful'. Related IxD posts discuss the creative aspect of using a font. However, if you look at the type faces google is offering they look like rats have chewed on the letters even at larger type sizes. This is a usability issue since it makes the text so hard to read.
Fonts like Verdana and Georgia were designed for all the tiny light bulbs that make up a screen and really improve legibility.
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