I would like to discuss the list of spamming methods that people use on various forums, directories etc. I would like u guys to discuss it here so every one of us are aware of..
The only one I know of is from automated bots. But they can be easily avoided by the use of a captcha.
Maybe he wanted to know about spamming techniques that weren't automated? Look for forums with SEF urls. High PR memberlist. Old/inactive topics with PR you can raise from the dead. Anchor(s) in your signature, anchor(s) in your posts, normal link from your profile usually. Voila.