I've taken several, but the only one that's worth anything (so far) as far as truly valuable content is Web CEOs. It really is fantastic information (the professional unleashed) and I haven't found anything else as comprehensive. I don't know the value of it, but I'm proud of my certification there (it's the only one I'll actually display).I've only recently started studying the content for the Google AdWords Certified program, but it's pretty good and incredibly comprehensive for being delivered with video. And it's free to study until you want to take the exam, which is like $50. Also, over the course of 90 days, a minimum of $1000 must be spent. They want anyone they certify to actually have decent experience in what they're doing. I can very much appreciate that.It would also be a great idea to study the heck out of Google Analytics. Wow! Hope it helps.Russell
http://www.marketingexpert.com/