“Grey’s Anatomy” (9 p.m., ABC): It’s a lot more difficult to loathe Izzie

“Grey’s Anatomy” (9 p.m., ABC): It’s a lot more difficult to loathe Izzie now that she has cancer on “Grey’s Anatomy.” Tonight she helps plan Meredith and Derek’s wedding. Oh, dear, sweet Izzie.

“30 Rock” (9:31 p.m., NBC): Big news on “30 Rock.” Jack goes in search of a rock for Elisa (Salma Hayek). We’re talking an engagement ring, of course. Wanna bet he screws it up?