I found this nice free (lic:
CC 2.5) flag pack (.zip 291kb) at famfamfam. It has Win & Mac, gif and png flag icons like the ones SMC posted but for every country::
http://www.famfamfam.com/lab/icons/flags/
*If you are a Win user and you are wondering what the .ds_store files are, they are harmless Mac files for storing a folder's custom attributes (
.ds_store@wikipedia.) Feel free to delete all .ds_store files and the Mac folder if you want.