I am a registered member in Wikipedia; as it says on Wikipedia FAQ, if you do not register, your ip will be visible to all when making changes. I try to locate an article that is very related to the link I want to promote, and then just edit the external links section of that article to get my link there; when doing this, is a good idea to check the This is a minor edit box, so your manipulation goes more sneaky to the censors' eyes. Depending on the article, your link can endure only minutes or even months. Some articles are highly watched.
At the moment, I have my links included in the following articles: Virtual Studio Technology Synthesizer Sampler Visual Basic Windows API HTML Punto de fuga