Graphic for your application or site

Working on the Semantic Links wiki site (http://www.semanticlinks.net/wiki) I faced a problem of high-quality free graphic resources (icons/buttons). So I found several good sites that provides such resources. First of all thanks a lot to Nikolai Bird (http://www.webdesign-guru.co.uk/icon/) for his Web 2.0 graphics (http://www.webdesign-guru.co.uk/icon/web-20-graphics/) and collection of free icons links (http://www.webdesign-guru.co.uk/icon/free-icons-graphics-links/) And of course I found IconLet search engine (http://www.iconlet.com/) useful. It provides search for icons having the following search parameters:

• name
• format (gif,png)
• resolution
• license (free, GPL, Creative Commons, etc ...)

Just one disadvantage - it's impossible to specify several resolutions (or range). Well and last - Icons on wikipedia (http://en.wikipedia.org/wiki/Wikipedia:Icons).