AdsDaq (no requirement) - While they only provide CPM ads to specific countries, their ability to display backup ads from any network makes them an easy first choice for somebody looking to test the waters of the CPM market.

Ad Dynamix - (no requirement) - While not quite as intuitive as AdsDaq, their minimal requirements make Ad Dynamix quite approachable even though their customer support is poor.

ValueClick (3,000 pageviews per month) - While their pageview requirements are quite low, ValueClick is known to be picky with the type of site they will approve.

Morning Falls (10,000 pageviews per month) - A relatively low traffic requirement, solid customer service, simple implementation and easy to understand reports make this a good CPM publisher for beginners.

CPX Interactive (10,000 pageviews per month) - A relatively new face on the advertising scene, CPX Interactive offers good integration and solid reporting. Meeting the traffic requirements is not always good enough, however, as their internal approval process is on the strict side.

Burst Media (20,000 pageviews per month) - Burst Media is an intermediate advertising publisher. Their overly-complicated integration and reports, as well as their poor customer service hold them back from the upper echelon of advertising networks.

Casale Media (10,000 unique visitors per month) - A good intermediate ad publisher, perfect for an established site that has not quite reached A-List status just yet. Casale Media handles larger sites as well, making them a good long-term choice for many sites.

Tribal Fusion (60,000 unique visitors per month) - A solid pay scale, depending on your niche. Tribal Fusion represents hundreds of sites with a wide range of categories.

Brightroll (100,000 video views and 250,000 pageviews per month) - Along with Video Egg, Brightroll is the only other advertising publisher on this list that is truly centered on new media. Their video view requirement automatically puts them in the advanced category.

Adtegrity (500,000 pageviews per month) - While their orange and green color scheme may make you scratch your head, Adtegrity is known for their quality customer service and is quickly becoming a leader in the advertising network field.

Advertising.com (2 million pageviews per month) - One of the heavy hitters of online ad publishing, their high pageview entry point means only well-established sites need apply.

Video Egg (10 million video views per month) - The cream of the new media crop, Video Egg concentrates entirely on advertising in online videos.