|Chandoo is a fellow Excel MVP who has been at the online training game a long time. He offers a full Excel School online, as well as a dashboarding course and a variety of others. I can guarantee that you'll learn some useful tricks by working through is material.
To learn more or sign up, just click here.
|Learn PowerPivot from the guy who not only wrote the books on it, but actually worked on the development of the initial product. Rob's work is fantastic, and the course is comprehensive.
You can find out more about it by downloading his brochure here: PowerPivotProOnlineUniversity.pdf.
And when you're ready to sign up, this link will take you directly to the page to do so.