I will be happy to send you the sheet that I use, All you have to do is paste LY's data in the 2008 Tab, Paste TY's Data in the 2009 Tab and it will chart out a lot of data and trends.
To me Trends by Day of Week give the best picture of the health of your site.
Other comparisons are TY LY by Month and a few others.
Beware, it also charts out Revenue per Click and that has been a scary trend lately.
I guess I can send it to you if you message me with your email.