It's a common problem, not having as much cash as you want to, and Skype's solving it with a common web solution: advertising. It may come as a surprise to hear that the eminently popular voice and chat service doesn't peddle stuff to its users already, but it's now formalizing a plan to introduce a carefully controlled measure of paid-for display ads on the Home tab of its Windows desktop client. You heard that right, there's no mention of Mac or mobile services here, and it's fu
