Looks like an interesting season! There are several Americans in the house (info from Wikipedia):
Ben Adams: Ben Adams is a former member of boy band A1.
Coolio: Artis Leon Ivey, known by his stage name Coolio, is a rapper.
La Toya Jackson: La Toya Jackson is a member of the musical Jackson family.
Lucy Pinder: Lucy Pinder is a Glamour model. (Evicted Day 8)
Michelle Heaton: Michelle Heaton is a former member of band Liberty X.
Mutya Buena: Mutya Buena is a former member of pop group Sugababes.
Terry Christian: Terry Christian presented the TV series The Word. On Day 1, Terry became the first celebrity Head of House.
Tina Malone: Tina Malone plays Mimi Maguire in the hit show Shameless.
Tommy Sheridan: Tommy Sheridan is a Scottish politician, known for being embroiled in various legal battles, in particular with the News of the World.
Ulrika Jonsson: Ulrika Jonsson is a television presenter, best known for her work on TV-am, Gladiators and Shooting Stars.
Verne Troyer: Verne Troyer is an actor best known for playing Mini-Me in the film series Austin Powers.
Official Channel 4 Site
My friends in the UK say that so far, Coolio is a mad genius getting into everyone else's heads. And La Toya can't stop talking about how her ex-husband abused her. And, unlike his stay on The Surreal Life, Verne hasn't peed on anything inappropriate yet.