Google vs. Ebay?

In the ever-morphing world of online commerce a Google vs. Ebay match-up should not come as a surprise. To my mind, however, this seems to be more of a new front in the ongoing war between Google and Yahoo!. If anyone is going to suffer from Google Base, it's going to be Yahoo! Stores. Of more interest to the online marketing world, however, are the new advertising tools that Google is working on for Google Base.