Dafont.com is a long cherished resource for fonts, including dingbats. I recommend checking out their stuff. You can use this in documents, as vector stock as a basis for your own art, you can put them into prototypes and mockups.
Please watch out for contributors who just vectorized trademarked logos and characters and such. These fonts are not actually for commercial use, even though they might be labelled “100% free”. They contain graphic material which is not own by the font creator, so the font creator can grant you no rights for them.
Check out their library here: http://www.dafont.com/mtheme.php?id=7&l=10&l=1