ScrubIT (filters pr0n, so probably not what you want): "ScrubIT offers clean, reliable, and speedy DNS service FREE of charge. Our filtered DNS scrubs out the bad stuff and is absolutely simple to setup and use. Try it today!"
* 126.96.36.199 * 188.8.131.52
OpenDNS (you'll get ads on DNS misses): "Taking a few minutes to unbundle your DNS service from your ISP's Internet connection means a safer, faster, smarter and more reliable Internet experience for everyone in your household."
* 184.108.40.206 * 220.127.116.11
vnsc-pri.sys.gtei.net (no idea who or what this is; but their DNS sure is open):
I guess I wouldn't feel bad about using their wireless connection as long as they aren't being charged for the bandwidth that you are using and you don't expose them to some form of liability (illegal filesharing) or endanger their network with *virii.