A Bookmarklet To Find Perfect Fallback Fonts – FFFFALLBACK
We are using new web fonts each day and need to pair them with standard fonts for a better use experience.
FFFFALLBACK is a bookmarklet which, once clicked, scans the web page, finds the web fonts used and creates an interface where you can easily try alternative fonts.
It lets you to instantly toggle between the original and fallback outputs or can show them both so you can better decide if your web page will look ok when no web fonts are displayed.
The project is the result of a very nice article, Type study: Choosing fallback fonts, which will probably end up in "you sticking stronger to the bookmarklet" : ).