Small Business Owners - Your most vital reports?

[Lou]

I must say, I have not been utilizing my financial reports in GnuCash.  
It has simply been a way to track everything for tax purposes.  Now that 
my business is growing, I'd like to hear from some of you more 
finanically savvy GnuCash business owners.

My request is two pieces of information.

1)  The type of reports.
2)  What you find useful about the report.

I think we can make a list that is useful to many others in the same boat.

Thanks in advance.

Lou