If you're a Lost nerd like me check out this interview with executive producer Damon Lindelof.

"Will we ever get more on the backstory on Libby ... or at least find out her last name? -- P-D Cougar

Libby is someone we get asked about a lot, and she's another one of those cases where it's more of an issue of our relationship with the actor than it is our desire to tell the story. It's our hope that Cynthia Watros will come back one more time and finish that story, but that's up to her. We asked her last year, she wasn't interested in doing it. Hopefully she'll change her mind."

I've always wanted to know more about Libby (more specifically how she ended up in a mental institute with Hurley) but looks like that's probably not going to happen.