Last modified: 2011-03-13 18:06:35 UTC
MediaWiki doesn't have a default favicon.ico currently, something with the MediaWiki flower should probably be made, I tried but that image doesn't scale very well down to 16x16 px.
There is a favicon with the MediaWiki flower available on the MediaWiki sourceforge site, but I don't know anything about the copyright of it: http://wikipedia.sourceforge.net/favicon.ico
Brion appears to be responsible for putting it there: -rw-r--r-- 1 vibber wikipedia 1.2K 2004-11-21 15:51:49.000000000 -0800 favicon.ico
People should always provide their own logos and icons, unless they're running MediaWiki's own web site.
I disagree, we already provide a the MonoBook logo as the default wiki.png, unless you're proposing that we replace that with a transparent PNG of the same size this would only be an extension of the current interface which provides some sane defaults which can be replaced later. Furthermore even if this doesn't make it into the default user interface we favicon used on Wikimedia websites (see general.