You hear everybody and their brother talk about all of our new features and often they do sound complex and you wished they had a video or something around that particular feature. I believe Multi-Currency is one of those enhancements... 

A screen-cast was posted today on Channel9 by Sanjay Jain a Microsoft Dynamics ISV Architect Evangelist. In this screen-cast Sanjay will walk you through this powerful enhancement in CRM 4.0 covering Setup, Usage and Customization aspects.

Go check it out here