CSS Hacks -
Most of the time conditional comments are the way forward but when you don’t have that option, CSS hacks are there to help you out.
Paul Irish has compiled a great list here.
web design theory
kill FOUT use the WebFont Loader
Tipsy - a jQuery tooltip not a result of C2H5OH -
A jQuery plugin for creating tooltips, similar to the ones used by facebook, forrst and github