This was originally posted at the Dh forums by Akagi, these are free domain names that either redirect an address to your site or give you full DNS control -

DNS
www.Uni.CC
www.za.org / yourname.za.net Note: Only applies for those with South African address
www.eu.org
www.cjb.net
www.sitelutions.com
http://nic.biz.ly
www.dyndns.org
http://da.ru

Redirection
www.dot.tk
http://www.freeurl.com/
http://www.shorturl.com/
http://www.active.ws/domains/
http://www.dyns.cx/
www.freedomain.co.nr
www.dyndns.org
http://www.now.nu
www.no-ip.com
http://da.ru

Feel free to add to the list by posting, I'll edit my post to include yours :)