Here is an interesting news clip, ganked from a Yahoo news post further ganked from an US News article:
"3. Bodice Rippers
Harlequin, the world's biggest publisher of series romance, saw North American sales rise $3 million in 2008's fourth quarter from a year earlier. Other escapist literature also has done well: Although most book sales were flat or down in February 2009 from the year before, a spokesperson for the Borders book chain says that science fiction and fantasy were up—as were humor titles"