There are some sorts of repayment of advertising services.

Pay-Per-Click - You place on the server banner or link on another site, if someone will become interested and will click on link, to you for each click pay money. The sum oscillates from $ 0.01 up to $ 0.55.

Link	Pay per click	Size of network	Comments
ClickSales	min $0.03/click through your site	600.000 impressions/day	programs pay-per-downloads and pay-per-signup
ClickAgents	$0.10/click, $1/CPM	3500 sites	600M/mo
Value Click	$0.12-$0.25/click, $0.01/referral	25% US-based Internet population	No free hosted sites
Glick2Net	$0.06-$0.10	50.000 web sites	No illegal, adult, warez... sites
Media hits	$0.05	N/A	No personal, illegal, adult, warez... sites
Safe Audit	$0.05-$0.30/clickthrough, $4 CPM, $50 CPL	40.000	$4 CPM, $50 CPL
Advertising.com (ex-Teknosurf)	$0.02/click, $2/lead, $5/referral	5.000+ sites	Minimum visitors is 10.000/mo. No sites with illegal content or activity.
DirectLeads	$0.02/click, many programs	over 4000 sites, over 1M clicks/mo	You need to have 3000 unique visitors/mo
StarsAds.com	$0.20	100M banner views/mo	-
Lycos Traffic Affiliate Program	$0.02-$0.03/click-through	7M visits/day	-
Aaddzz Brokers	$0.01-$0.99	?	No sites with traffic lower 500/day, no adult, warez...
AdClub Network	$0.10/click	About 1500 newspapers in the US and Internet Ad	No sites with traffic less than 5000/mo
Ad-Up	$0.25-$0.74/click	?	No personal home pages, E-Mail Services, "under construction"...
Banner Brockers Network (alliance with AdForce)	$0.10/click	About 1500 sites and 600M ads/mo	No sites with traffic less than 5000/mo
Banner Media	$0.04/click + $8/CPM	NA	No sites with traffic less than 10000/day, no adult...
Banner Pool Networks	$0.06-$0.14/click, $0.25/unique visitor		No traffic restrictions, no all illegal sites