I've posted a new update, v1.2.

This one has some work done by oleganza, including the ability to switch between reference currencies. I believe this data is still based on Mt.Gox USD and just converted to other currencies, but I'm not sure since the data comes directly from Mt.Gox.

I've also added configurable font size, in case you want it to take up less of your menu bar or if you want to make it bigger and more visible.