One of the best ways to inform users, as well as search engines of your glorious web site is to tell the numerous directories. It is not as easy as it perhaps could be, with some of the more respected directories like DMOZ experiencing backlogs of over a year, but it is well worth the effort.
Our directory submission service uses the fact that you get a chance to write a succinct description of your service to each of the directories submitted to. with more directories out there than you can shake a stick at that can end up being a lot of one way links, but it can also end up being very expensive.
You choose, we can submit you to a few free directories, or spend a few weeks spending your money making sure you are submitted to everyone, and the cost of directory submittal can vary from a few dollars to $300, so we like to adjust the need to submit to your budget.
There are a few directories that everyone should be in, like DMOZ, but the wait can be so long you may have moved on by then.