Dmoz?

The biggest advantage to a DMOZ listing is the amount of other sites that use the DMOZ data dump (rdf.dmoz.org) to populate their own directories. So your 1 link there will be distributed (eventually) to hundreds of other DMOZ clones. This does not mean that the links from DMOZ clones are worth much however.

I am in DMOZ for 1 of my sites and I havn't really seen much difference,

This is an interesting mix of opinions. I will list a couple of my sites to check it out for myself. Thanks for all of the input from everyone.

I have just applied a site, lets see how it goes