AdPlugg makes it easy to serve ads to your website or blog. Use their ad manager to configure things such as ad schedules and ad rotation. Then use their ad server to serve ads to a website or blog. All ads are tracked and can be analysed  using their analytics system. The Free Plan, designed for small business and start-up sites, allows users to serve their ads with a Free Ad Server. A $10 base, scalable usage fee for more than 100k impressions/month is also available.