What do Yahoo! (NASDAQ:YHOO), CNET (NASDAQ:CNET), The Knot (NASDAQ:KNOT) and Amazon.com (NASDAQ:AMZN) all have in common? For one, they're all listed on the Nasdaq. But they're also just a few of the worthy contenders for the title of 2007's best e-commerce stock.

Though each company has had a rough time so far this year, many people still believe in their prospects. Will Yahoo!'s diversified group of media properties help it shoot to the top of the list in 2007? Fool analyst Steven Mallas thinks so. Will CNET's strong tech presence and insight into the early-adopter market allow it to regroup after losing its CEO? Longtime Fool Rick Munarriz would bet on that. Meanwhile, Motley Fool Rule Breakers contributor Tim Beyers is confident that The Knot's ascent isn't over yet. And Alyce Lomax, ever the optimist, is rooting for Amazon to escape from its doldrums and rally its consumer base with its new service offerings such as Unbox and Askville.

These stocks all have the potential to be the year's greatest in e-commerce -- and they're not alone. We've got nine worthy competitors, each with the prospects to make it to the top. E-commerce companies are big on potential, and it's smart to include a few of them in your portfolio. Some of our best analysts have laid out their bull case for what they believe will be the industry's top stock for 2007.

Once you've read their arguments, make your own opinion known in the free Motley Fool CAPS stock-rating service. If you agree, rate the stock an "outperform." Disagree? Rate it an "underperform."

We'll declare a winner early next week. For now, you can begin the quest for 2007's best e-commerce stock by reading the analyses below. Then join CAPS to add your rating today.

Yahoo! and Amazon are Motley Fool Stock Advisor selections, while CNET and The Knot are both Rule Breakers picks. Try any of our Foolish newsletters free for 30 days.

Shruti Basavaraj does not own shares of any company mentioned above. The Fool's disclosure policy is always a winner.