Nottingham shooting has been pushed back to April (orginially set for February). According to a source, Russell Crowe is having some issues:

An insider said, "It is a mess. Russell never lost the weight he put on for 'Body of Evidence' - and so the love scenes between him and Sienna would have been laughable. He's so old and fat and she's so young and gorgeous. It's just . . . gross." 

Though I don't exactly agree that Sienna Miller is gorgeous, a fat Russell Crowe is definitely gross.  One of the producers on the film said, "We can't have Robin Hood looking more like Friar Tuck."

Sienna Miller has also apparently been released from the movie and will NOT be playing Maid Marian. Hmmm... don't think it matters.