I want to

DomainFinder

DomainFinder is a web application for webmasters which helps you to find fun domain
name. For exemple, if you type My house, DomainFinder will suggest you
"my.ho.us/e" (Thanks to lo-fi for this one)

web2names - find your dream domain name

web2names - find your dream domain name. There are a few of these services about and this is the latest I've seen. Simply type in your word(s) to define your site and it'll come up with possibles for you as well as those that are taken. Simple, does what it says on the tin.

Domain Name Values

LeapFish.com - Free Domain Name Appraisals   Domain Name Values. Plug in your domain name and it'll tell you how much it's worth. www.philb.com is apparently worth $543,543.00 which is quite frankly absurd, though if anyone wants to offer me that much for it, I'll take it.

NameWidget Domain Searcher

Link: NameWidget Domain Searcher. This is very neat. Simply start typing, and this little utility will let you know if there are any domains that match what you're typing, and if they are available. Very fast and effective, though it doesn't do .co.uk domains - it seems to limit itself to .com, .net, .org, .biz and .info domains.

Whois Source

Link: Whois Source Automatically generated suggestions

Instant Domain name search

Link: interactively search for available .com and .net domains.