501c3 Info

[krazydog]

Nolo Press, books on forming a 501c3; has general and state-specific info:
http://www.nolo.com/product.cfm/ObjectID/5C6811EB-C2B2-414C-B126D98C0F5364B4/111/

IRS web site, info for nonprofits:
http://www.irs.gov/charities/charitable/

Information about IRS requirements, etc. for 501c3 status:
http://www.charity.com/indexresources.shtml

Addresses legal issues concerning nonprofits:
http://www.nonprofitissues.com/

General nonprofit info:
http://www.nonprofithub.com/

[krazydog]

More info below concerning starting and operating a 501c3.

It seems that many states have independent organizations and/or state departments that offer assistance to nonprofits. Doing an internet search on "nonprofit assistance" + the name of your state might briing up some helpful info.

General info
http://nonprofit.about.com/

Seattle area nonprofit assistance
http://www.nacseattle.org/

San Francisco Bay Area nonprofit assistance
http://www.compasspoint.com

Texas nonprofit assistance
http://www.tdhca.state.tx.us/ppa/housing-center/nonprofit.htm

Sample Articles of Incorporation:
http://www.mapnp.org/library/legal/articles.htm