Great video I recently watched on measuring Google Analytics campaigns:

Multi-Channel Funnels allow you to compare the most financially beneficial channels.
If you’re serious about tracking campaigns through AdWords / CPC, Email newsletters, or Affiliate marketing, this video will sum it up for you.
What’s In There…
When you track Google Analytics Campaigns across channels, it’s important to define each channel so the data is clear. Watching this video gives you access to a few very powerful tools, including a bulk campaign tagging tool, very useful to layout all your campaigns in one shot. Here’s another one from EpikOne.
You can find the presentation of the video here in PDF format.

