I really love using Seller Tools, not only for creating sales, but for the treasuries. I think those help my sales more than anything. I've been able to make one very easily and quickly. The best part is the notifications you send out after the treasury is made!
I like the keyword tool, It really puts things in perspective. I love the ability to see what is the most popular in my shop via views and purchases. The sort function is awesome! I just clicked on the analytics reporting page for the first time today and it seems like there is a lot of meaty information there!