Here’s a very interesting theory. The guy(s) at BuddyTV came up with the theory that since Widmore had Claire’s boyfriend’s art in his office he might be his father. It could just be a props coincidence, but it sure is interesting. I would never have spotted something like that, so I’m glad there are other bloggers who can come up with these things.
Check it out here. It’s hidden in amongst some more obvious Ellie/Mr. Widmore theories.