I would like to point you to an interesting website, called www.kpilibrary.com. It’s a community where you can post your key performance indicators and their definition, and get an overview of the KPIs others are using. Why reinvent the wheel if you can learn from what others have done. On this website, you can find KPIs in the area of sales, marketing, finance, IT and so forth.
It seems the community has over 40,000 members already.