Cost-per-action networks are all the rage today. But what will it take for a network to win with 400-plus competitors? And how does a network keep ahead of the curve (and the FTC) while building its publisher and advertiser base and fending off tracking and fraud issues?

These are the tough questions that CPA networks face.

Over the last five years, almost all of the topics I’ve written about focus on some aspect of performance-based advertising. My fascination with the subject stems from a desire to understand the role performance-based ads play in the broader ecosystem for advertisers, merchants and affiliates.

Top interactive agencies and affiliates share their tricks for picking the right ad network.

Conservatively estimated, there are upwards of 400 ad networks globally. There is a Japanese iPhone-only ad network and the recently launched Village Voice alternative weekly New York newspaper ad network – and everything in between. For ad agencies representing top brands, and for affiliates trying to make a living in the increasingly competitive world of performance marketing, picking the right one is critical to survival. Choosing poorly spells disaster for everyone.

Over the last seven to 10 years, paid search has proven to be a cost effective channel for affiliates and performance marketers alike to drive high quality leads while maintaining strong ROI. In fact, search engine marketing (SEM) frequently represents an inordinate portion of a performance marketer’s business – often more than they care to admit.

You can maximize the performance of your marketing campaigns by consolidating all of them under a single ad platform. This will save time on administrative tasks, offer comprehensive analytics on campaigns across multiple channels and help you optimize them accordingly. Affiliate software is in a unique position to consolidate campaigns from across different channels because it monitors the entire acquisition process. By supporting and tracking different marketing models and offering comparative reports, the right software will provide the intelligence you need to maximize your return.

All of the predictions that 2007 would be the year of online video came true in spades - it rapidly gained in popularity as a medium last year and its momentum continues today.

The long-lasting Hollywood writers' strike possibly hastened the migration of people to pass their time visiting online video sites due to the lack of television programming. It's not just old episodes of "Grey's Anatomy" they are watching online, but all sorts of content.

His speech is peppered with "awesome" and "ready to rock and roll," as if he were fresh out of high school. He's only 32 but he feels luck has a lot to do with his good fortune. He took what was basically an idea to sell jam and turned it into a successful online marketing company.

Japan's had it hard. After nearly a decade of stock market doldrums and an economy on the brink of disaster - just as the rest of Asia struggled too - Japan bounced back. Growth happened. Its economy is still a tad slow, but there are many industries looking way up. Online marketing is one of them.

Has this ever happened to you?

It's late evening and your weekly newsletter, which would normally be queued for delivery on your autoresponder and blog by this time, is still nothing more than the vast white expanse of a blank Word document. Not only haven't you written a word, you also don't have the first clue what to write about, or which product you should try to sell.

Although you are usually passionate about your topic - organic vegetable gardening - you begin to wonder what the heck you were thinking when you chose to build a site around a seasonal niche.