The cast of Castle answered a bunch of question when EW caught them at PaleyFest '10.
Here's a tidbit:
Will They or Won't They?:
"Their relationship, like any relationship, will be prone to complications," Marlowe said of Beckett and Castle. The producers would like to keep a sense of mystery and not rush into anything, which suits Stana Katic just fine. "I think there's nothing sexier than swordplay," she said. But Beckett isn't all about Castle. Viewers will learn more about her life before Castle came into the picture.