I like the following three sources for nonprofit governance:
Board Source www.boardsource.org
The Independent Sector www.independentsector.org
Blue Avocado is an online magazine for community nonprofits. Published every third Tuesday through an HTML newsletter and delivered to more than 50,000 readers, Blue Avocado subscriptions are free. I think this e-magazine started as a quasi-marketing tool of CompassPoint (a consultancy specializing in NPOs), but grew beyond the firm. I recommend the Board Cafe – the link below is a good article about a board’s role in governance.