The basics of what it means to be a nonprofit organization, from set-up to fundraising,are presented on this About. com site.
Nonprofit Action is an online resource hosted by OMB Watch to support nonprofit advocacy, lobbying and coalitions. It has articles for everything from lobbying to litigation.
Network for Good offers numerous resources to educate board members (and others) about using the internet for newsletters, petitions and advocacy. It includes many helpful links to other, more specific sites.
Contact information for elected officials
and other decision makers
USA.gov offers contact information for elected officials from state level up to the president.
State/Local Government on the Net provides contact information for all U.S. state, county, and city government websites, with links for everyone from the governor to local city officials. The site can be searched by topic, state or office held.
New York City's website offers links tocity agencies and elected officials as well as services for residents and businesses.