How to add search domains in Ubuntu

I have lived with the following annoyance for the past year. At work I can't resolve various server names without editing the /etc/resolv.conf file and adding the following

search www.example.com

No big deal, except every time you connect to a new network this file is automatically overwritten with information received from DHCP. This is really annoying and after adding that line by hand for a year I finally got a solution!

It is really simple. Edit /etc/dhcp3/dhclient.conf and add the following line in there:

prepend domain-name "thoughtworks.com ";

duh! Many thanks to my friendly neighborhood sysadmin and this webpage