Summer Glau has made a couple guest appearances so far on Season 2 of THE UNIT. They are episodes 3 ("Extreme Rendition") and 6 ("Force Majeure"). I didn't see the first one, but the second one had only a couple of scenes with her -- one in a bikini. Admittedly, she's not a voluptuous girl, but it was a pleasant surprise, anyway. She's playing the wife of a Unit wannabe.