Overhead Cost Study Project - A variety of Guide, Policy Briefs and other information on how nonprofits track their overhead costs, the quest for benchmarks and best practices and other issues.
Unified Chart of Accounts - This page provides a useful tool for setting up your chart of accounts for easy reporting on the IRS Form 990 and other standard financial reporting forms.
Other Expenses - How do nonprofit organizations report "other expenses" on their IRS Form 990s?
Fieldstone Alliance (formerly part of the Amherst Wilder Foundation) has a wealth of practical books and publications, and also offers consulting services.