CPA (pay per sale/lead generation), and CPC (pa-per-click) advertising network. CPC offers are initially restricted and offered only to affiliates who have proven conversions through CPA placement.
By generating referrals, you earn a 2-tier 5% commission, as well as a bounty of $2.00/referral.Sites must have a minimum of 2,000 unique visitors per day. Only accept sites from the USA or Canada. Payments are made NET60 with $50 minimum.

BeFree

Dozens of well known, but often unreliable merchants.
Pay per lead and pay per sale models.
Checks are issued by merchants, not BeFree network.

ClickBank

Credit card processing company and affiliate network with several thousands of merchants selling info-products.

ClickXchange

About 5,000 of CPA, CPL, CPC and CPM offers. Many of their advertisers are guys with several bucks, so be wary.Checks are paid monthly with no minimum.
5% commission on the earnings of every webmaster you refer, plus $10.00 for each referred advertiser.

clixGalore

Reliable Australian affiliate network comprising of over 1000+ merchants and ten of thousands of affiliates. CPA and CPC models.
ClixGalore has a monthly pay schedule and will mail you a check when your commission reaches US$50 or AUD$100 or UKЈ35 or Ђ60.
No special requirements.

Commission Junction

Very reliable and friendly network both for affiliates and merchants. So it is not surprise that CJ is the largest affiliate network having about 2000 of merchants and 130,000 affiliates. Thousands of pay per lead and pay per sale offers.

Commissions earned from all merchants are pooled together in one check.
Minimum monthly payout is $25.00.
$2 for every referred webmaster.
No special requirements.
Recommended.

iCommissions

Originated in 1997 as an internet-based web affiliate program for the website iSubmitter.com, have grown to fourteen pay per lead affiliate programs in the Financial Services and Internet Business Solutions arenas.$2.50 plus a 15% commission on the earnings of your webmaster referrals.
Commissions are combined into one monthly check.

LinkShare

LinkShare is a reliable provider of over 500 pay per sale and pay per lead affiliate programs. Earnings depends on which merchants you promote.

Doesn't pay aggregated revenues but now LinkShare requires merchants to pay no later than 35 after the end-of-month. Minimum payout is $10.00 - 50.00 with most merchants.
$1.5 for every referred webmaster. No special requirements.