From Pew Internet and American Life Project, specific to older Americans but has broader information as well.

From the site:
We're organizing across the state to win equal rights for all couples.

Excellent online book about the entire process of creating a website. The "Process" chapter is particularly useful for planning a website.

Has page-builders and hosting available for a reasonable price. Good for a brochure site.

Similar to Homestead- site builders, cheap/free hosting, etc.

Voluminous online docs for those building sites themselves.

Excellent free web-building tutorials.

Another techsoup article about how to weigh doing technical projects via various methods. As always, good reading.

Techsoup.org again. Great stuff!

An excellent (if a bit wordy) process-oriented guide on how to choose a consultant from the American Planning Association (I'm guessing urban planning. . .) Nice set of criteria and definitely larger-scale than many non-profit-y projects tend to get.

Non-profits can learn a lot from the for-profit world and still maintain a soul. I think this article has some interesting stuff to say.

Mostly Massachusetts/NE-based non-profit techie mailing list.

Non-profit webmasters.

Has a database of non-profit consultants.

Some folks swear by posting projects on Elance- myself, I've heard a lot of "bait-and-switch" horror stories. I think you're better looking for local recommendations, but they are here for completeness.

Tips on how to write well for the web.

Run your site through Bobby to see how you're doing in terms of web accessibility for the visually impaired.

An excellent book- now entirely available online! Even if you don't do web design yourself, read the first couple chapters for background info, pretty convincing on the importance and value of accessibility.