I just made a whole bunch of new icons for our website using the Flat Design Icon sets #1 and #2 from Pixeden. They're free, royalty-free, and attribution-optional. Each set of 16 icons (including more than the library-oriented ones above) comes bundled in a PSD, so you can change the colors to suit your site. In our case, blue blue, blue. Inspiration? The Flat Design look popularized by Microsoft and Google.
PS. The phone and person were traced from various wingdings, which is why they're not quite so nice-looking, but I assigned the same Layer Style to them so they'd match