Meg Whitman has a nice post explaining what this means for EBay users, and encouraging them all to get Skype accounts. She says:
Working together, eBay, PayPal and Skype will redefine online trade and community. I hope you’ll join us in this exciting new chapter in eBay’s history.
Over on Ebay’s Investor Site there is a whole list of Skype related material which they’ve posted as well.