ODP (Open Directory Project) is owned by AOL and supplies directory
results for some major search engines, in addition to hundreds of independent
sites. ODP does not charge for submission or listing and listings are
decided by volunteer editors.
AOL, Netscape, and Lycos use ODP information in their main results.
Google also uses ODP in its main results, but Google uses its own relevancy
and ranking algorithm.
Other major sites using ODP (to a lesser extent) are:
MSN, Excite, AltaVista, HotBot, and CNN.
You should follow the same tips for getting listed in Yahoo when submitting
to ODP. You should submit your home page to the best category, and at
the main ODP site itself (rather than one of its partner sites).
If there are multiple categories that are appropriate, submit a different
page to each category - though not all at once or the editors will think
you are spamming! Remember, your submission will be reviewed by an editor.
To submit multiple times, submit one page, wait until it is listed before
submitting another page.