Bitboy, thanks for your awesome vector logos! I've modified one of your gold coins to use as the logo for my new C# BitCoin client library BitCoinSharp.

As you can see Inkscape wasn't able to figure out the inner circle from your Illustrator file so I've left it gray. I noticed that you made an SVG available but it only contains the more modern orange logos (I prefer the gold coin logos myself). Other than that I think it looks pretty slick for a graphically challenged programmer like myself.

The underlying SVG can be downloaded by clicking on the image above. As a derivative work I'm happy to release it to the public domain also.
Thanks again,
Nathan