I had a chance to write a guest post for Web Analytics  World last week. In it I talked about quickly diagnosing quick jumps or dips in traffic or conversions, and oulined three steps for getting to the bottom of a shift in traffic:
- Consider the Source
- Analyze Your Overall Mix
- Identify Who or What is Sending You Traffic
To learn more about each step and how you can accomplish the above in Google Analytics, check out the post .