If you’re into metro development (windows phone or Windows 8) I’m sure you’ll appreciate another set of cool mono-colored very simplistic yet beautiful icons.
iconmonstr offers a set which includes over 600 items with multiple variations for almost each element.
Icons are mostly focused for web apps as most of them are actions, charts, badges or social networking-related.
P.S. The only bad part is that the set is not offered as a single download pack but you have to browse pages to view/download each of them.