"Life Is Short, Have An Affair": What Do You Think?

I recently heard about the Ashley Madison Web site--a "discreet dating sevice" designed to match up married people (or others in long term relationships) for purposes of having an affair. Their motto is, Life is short, have an affair.
http://www.ashleymadison.com/app/public/media/index.p#pressreleases

They actively promote the idea of having an affair to deal with an unsatisfying marriage.


What do you think of this idea?

Is adultery a good solution to deal with an unsatisfying marriage?

Is there a difference between an affair that develops in a real life setting as opposed to one arranged by an online dating service?

Could this dating service even lead to a satisfying affair--beyond a simple sexual hook-up? What would make for a "good affair"?

Is adultery always wrong?