One thing you can't have too much of is advertising. Especially if it's free. Unless of course you only have a limited supply of product or services to sell.

Requires you to get 3 referrals, then it's all free. It's not too hard to find 3 people to give away free advertising to. Also pays cash for future referrals. http://www.hits2u.com/?532941

Interesting concept. A pyramid set-up where bringing in a few referrals will dramatically increase your viewing audience into the hundreds of thousands. Possibly even more. Possibly millions.
http://www.traffic-matrix.com?173

This is a worldwide autosurf site.
http://www.globalautohits.com/?ref=846

Another autosurf site.
http://www.doublerainbowsurf.com?r=58130

Another surf site. You'll get thousands of free hits, banner and text ads just for signing up.
http://www.fastcreeper.com/?ref=4944

Autosurf site.
http://www.ispeedsurf.com/?ref=318

And another worldwide autosurf site.
http://quadhits.com/?ref=126

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