You own a website, you wish to get traffic throught it and you are willing to pay for it; Which solution will you look at to generate new visits? Will you use Google ads, the Overture program or other pay per click program? Would you prefer be using some manual targeted advertising (you go over popular websites of the same category and ask for the price of a link to your site on their main page)? Both? ...
from my experience, yahoo search marketing had gave me a better conversion rate for less cpc rate. i wouldn't stop you from using adbrite.com either for purchasing links to post on other websites i wouldn't pay for directory submissions though...the only directory that I would say is worthed is yahoo directory and DMOZ...but they can be free