This is not so much a tip as it is a warning. Want to do some serious damage to the SEO of your website? Do what I did and park a domain unrelated to your niche, with decent traffic, on top of your own domain.

I recently parked "cars.com.na" on top of "namhost.com", not even thinking twice about the implications this could have. Implications:

• Massive spike in backlinks. So much so that ....
• Google made our Page Rank 0 (this ban has since been lifted)
• Loads of useless traffic to our site
• And of course.... did I mention this:

Conclusion:

Seriously think what you are doing when you park domains on top of each other.