Just go to a forum and make a relevant topic. Wait 1 month. Then edit your title and your content with your url. This way, people - moderators and snitch users - won't see your topic in the main page, so It can live forever. Yes, It's a manual job and if you pick the good forums and have patience you'll reap good. The goal is not to make the forum users to click your url. The goal is to increase your PR on google and let people who search your keywords find your link through the forum you spammed.