The Free Management Library provides a large range of links and materials organized by topic.

The Alliance for Nonprofit Management provides a set of answers to frequently asked questions about nonprofit financial management.

The SBA Online Women's Business Center has a large range of resources on finance and accounting.  It is not geared specifically to nonprofits, but much of the material is relevant.  This library of frequently asked questions cover areas including:  Cashflow; Using Financial Statements as Navigational Aids; Borrowing and Lending; Banking; Bookkeeping and Accounting; Budgeting; Finding the Right Assistance Providers; and Leases.