Smashing Magazine has just released On Stage icon set. The set contains 49 free vector icons including PSD which can be useful for both corporate and personal setting. You can use the set for free without any restrictions whatsoever.

The icons are available in the .png-format in the resolution 128×128px. 100% pure shape-based layered PSDs are also included in the package.

Requirements: -
Demo: http://www.smashingmagazine.com/2008/08/27/on-stage-a-free-icon-set/
License: License Free