Why would an Internet auction company want to buy an Internet phone firm?

EBay CEO Meg Whitman says Skype's voice capabilities will speed communication between eBay's buyers and sellers and increase the level of trust.

Skype gives away software that lets people talk for free over the Internet using computers and microphones. A paid version, SkypeOut, allows those calls to be connected to regular phones.

Auction giant eBay has made a giant bid of its own to gobble up Skype -- at least $2.6 billion in cash and stock.

Guest: Wade Roush, executive Web editor of Technology Review.com