Submitting to directories can be a great way to get one way links. Many are still free. Some of the more popular ones are
Yahoo Directory
DMOZ
BOTW
And new directories are created every week. Often new directories have a high acceptance rate. Some good places to find new directories as they are launched are:
Vilesilencer Announcement List
phpLD Advertising and Exchanges Forum
Directory Critic New Directories Section
If you have a new site, and want to get some links to boost your rankings or even just to get the search engines spidering you, this can be a great tactic to get things going. Good luck.