Best Traffic Channels, best ad networks

[gentleman]

Hi, guys,
What methods do you use to get targeted traffic, except SEO and social networks (forums)?
For example, PPC works very well in many vertical markets, but has a lot of restrictions with gambling.
Facebook and AdWords do not approve most ads, other small networks like Clicksor, Adbrite, Bidvertisier, Infolinks, etc. have zero value traffic, never use them!

What else?
Could someone recommend some good PPC channel to show gambling ads?

[hakank]

I can tell you about one site, but I won't say it's URL here since it's one of my non-gambling sites.
It's an ad network which sends traffic through pop-unders and ministitial ads.

Find me on LinkedIn or PM here if interested, but remember that I'm on holiday right now in Turkey so replies might be a bit slow from my side.