A couple of quick links. FastIcon has released a set Batman icons. So if you loved Batman as much as i did you can share the love with you're computer. The icons are fairly dark though so they the details are difficult to make out at 16x16 (detail / list view).
Buyicons.com has also released a button box set intended for Mac OS X developers who need small tollbar icons for applications that use the brushed metal interface. These icons are very tight and well worth the $49 price tag.