BizBot - BizBot is search engine geared towards business resources. Their excellent program is two-tier, and pays in several fashions. On the first tier, they pay $0.02 per unique click-through, $0.20 for each newsletter subscriber referred, and 25% commissions on sales of advertising at their site or of their book on advertising. On the second tier, they pay $0.01 per click-through, $0.12 per newsletter subscriber, and 15% commissions on ads or books sold.

CollegeRecruiter - CollegeRecruiter offers an extensive employment web site, with a well-designed affiliate program that pays on a per-click and commission basis. They pay $0.05 per unique click, as well as 33% commissions on any employment ad sales you refer. They are also two-tier, being part of the Commission-Junction system.

Mailbits.com - Mailbits.com was recently added as a Top Opportunity on ClickQuick thanks to their ability to add additional revenue to almost any web site. They are also two-tier, and pay for new subscribers you refer to their newsletters as well as paying you to help promote your site. How they do this it to give you a tool to allow your visitors to email their friends about your web site, paying you each time it is used. An excellent way to add some income to your site while promoting it at the same time.

Advertising.com - What list could be complete without listing Advertising.com, one of the original programs to offer dual income possibilities? Advertising.com is a pay-per-click network that is two-tier, paying for both click-throughs generated as well as bounty commissions for referring other webmasters to the program. They also have been selling a large portion of their advertisements on a CPM basis, guaranteeing web sites an income for simply displaying their ads.

Hopefully, over the coming months we will see an increase in the number of good programs that offer dual income possibilities. For most webmasters I have spoken with, these types of programs often offer the best opportunities for strong, consistent commissions, thanks to the multiple revenue streams you can generate.