These are some really handy icons created by UK artist Mark James.

License is public domain as stated on his site: http://www.famfamfam.com/about/

If sending me a message regarding icon licencing, please don't expect a response if you ask ‘I'm using your Silk icon set and linking to you from a footer/credits page, is this OK?’ (the answer is yes), if you wish to ask “Do the Flag/Mini icons sets need attribution or a link” (the answer is no – both sets are public domain), or if you wish to ask “Do the icons come in larger sizes?” (Unfortunately not, wysiwyg).