Browser-Specific CSS & JS Hacks: Browserhacks
All browsers have different behaviors while rendering web pages. Even their versions have inconsistencies.
Although this is a bad thing, it is possible to make use of these inconsistencies for targeting the right browser and the right version (which is sometimes handy for debugging or applying code that will only be applied by the browser wanted).
It is a single-page resource, includes hacks for Chrome, Safari, Firefox, IE + Opera and has a cool search box that eases finding the right hack instantly.
P.S. The project is open source and it is possible to contribute it with any new hacks.