Deidre Knight has an important post on her blog. It seems some enterprising soul, posing as Ms. Knight, has targeted e-pubbed authors. She says, "Apparently about three weeks ago someone claiming to be me sent a blanket email to roughly forty e-pub authors offering representation to anyone who was interested, 'guaranteeing' a sale in NYC and claiming to charge only 10%." Whether this person is trying to scam the authors or tarnish Ms. Knight's reputation is unclear. But be warned.
And in general, be wary of people offering unsolicited representation-- ordinarily agents don't approach authors. There are exceptions, I'm sure, but a certain amount of caution is advisable if an agent contacts you... as this story proves, it's good to be cautious even if you recognize the name. And NEVER trust someone who guarantees you a sale... unfortunately, no agent can guarantee that!