I kinda agree with Frankie, I think Carnell Williams is soft and won't hold up the entire year. I think Jamal will hold up but he is playing on the Browns and I think that last game against Cinci is an anomoly and not the norm. He will have to face the Steelers and Ravens D twice this year.
I think Branch is better than Galloway however, I think Galloway will have a couple of huge games wheras Branch is going to be more of a consistent WR.
I can't answer the poll because this is (in my mind) a pretty fair trade. Remember, Branch never had a 1,000 yard season with Brady throwing to him and the Seahawks have Shaun Alexander.
BTW, if the Bucs have a bad offensive day (which is highly possible), then both Galloway and Williams will suffer. So in that respect I would say go for the trade. It's just Lewis is going to going up against some much stingier D's, like the Pats.