While we're on the subject of the tube's revolving door, Desperate Housewives is rolling out the welcome mat for Richard Burgi, who recurred last season as Susan's obnoxious ex, Karl Mayer. This go-round, he'll be a regular and a love interest for Edie. But wait, wouldn't a love interest for Wisteria Lane's temptress be, at best, a short-term gig?