How do you brainstorm for good domain names today?

I recently found Bust-A-Name…
http://www.bustaname.com

Bust-A-Name lets you enter up to 20 keywords, group them, then see what combinations are available. I used to use DomainTools, but they are no longer a free service. You can purchase the domains you find at Bust-A-Name from your favorite registrar/host (i.e. GoDaddy) with a single click, but it’s optional.

I’m always looking new domain tools. If you know of another good one, please share it below. Thanks!