[cd34]

$6k/month fast. Hmm... start with $12k?

Can't do anything with search engines -- time lag would be too slow there and you stated fast.
You could submit free sites, but, I think people have mentioned 4-6 months before making real cash there.
You could do TGP posting. That has rather instant gratification if you choose the right sponsors and have enough bandwidth.
Traffic trading. Hard to come on to the scene and be trusted by a lot of the bigger trading guys, but, you could always build trades if you had the time.
Linklist -- again, time required there.
TGP - again, time required to make it big.
You could shoot a bunch of exclusive content and sell it. That might do it.
Blogging -- but then again, that's a few month process to get big.
Spam -- You can make quick money there and join that other guy in the jail cell.
bet it all on black.... er red... black... red...