www.idealist.org is a good all-around site

www.techsoup.org , www.nten.org and www.idealware.org are good for nonprofit technology, and 501c3 nonprofits can get donated & discounted software through TechSoup.

The Chronicle of Philanthropy www.philanthropy.com and Nonprofit Times www.nptimes.com are useful for keeping up with nonprofit trends.

Minnesota is a leading state for nonprofits, especially in corporate philanthropy, and www.mncn.org is a good resource

www.independentsector.org is a research and lobbying group for nonprofits and philanthropy

www.compasspoint.org here in the Bay Area is a useful resource for local organizations and there may be a similar org where you are, perhaps based in a local community foundation. They provide training, and assistance in finding consultants and board members.

www.foundationcenter.org is a good resource for information on foundations and fundraising.

Silk, Adler, & Colvin is a law firm specializing in nonprofits and their site has some good info, especially for new organizations, www.silklaw.com

Here are some that I have found:

http://www.firstgiving.org/

http://www.volunteermatch.org/

You can also search the United Way locally.

If you are by some chance in the Western PA area, you might be interested in the blog I created to be an online newsletter for nonprofits, http://togetherweflourish.com/

www.networkforgood.org , is a good news letter it gives tips hints and information.

guidestar.org is another that offers newsletters and guidance.

http://www.goodsearch.com goodsearch is interesting and offers new letters and ideas free.

These are ones I read regularly Guidestar offers information on organizations and rates them.

I don't know if you are familiar with ASAE

http://www.asaecenter.org/ they are like the focal point for a variety of functions. Check them out and if you have specific question on a type of resource question then there are different answers.

http://www.nptimes.com/ Try this web site

as well as all of the others which are very good.