I've been doing a lot of globalization work lately, so to capture some of my best practices around globalization, I've created a CodePlex project. Matt Dotson's Global Toolkit (http://www.codeplex.com/GlobalToolkit) is where I'll be posting code which can be reused in your global applications.
I've started to implement some stuff, but it is far from done, so take a look and tell me what you think. I've focused on a currency class so far that supports currency conversion, and currency enumeration. I've tried to make the toolkit extensible so that you can plug it into your own architecture.