I hear he had the surgery and is expected out a few months into the season, though he could come back earlier. Daily links posts are a good place to ask these sort of questions as well. (more people tend to read those)

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He had the surgery, here’s what he had to say about it (before he went under)

http://blogs.buffalonews.com/sabres/2010/04/rivet-to-have-shoulder-surgery-will-miss-start-of-next-season.html

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