Everything is layered and named.
These can be obtained as part of the Adobe font folio.
Other sans serif fonts should work as well.
NOTE: I have included both a .png (FireWorks and a .psd (Photoshop) layered files.
There are 5 editable .png files at 512×512, 256×256, 128×128, 96×96, and 64×64.
Each icon is transparent meaning it can be applied to any color bg.