Okay, this discussion is getting pretty scattered and it is hard to remark on everything people have said so far...
One thing I've always liked about Tori Hunter is how realistic he is about his abilities and what he adds to a team: "I'm going to make a difference on defense. I'm going to make a difference on the bases. And every once in a while, you'd better not make a mistake at the plate."
Andruw Jones could say I make a difference in the field AND at the plate. Objectively, this is a no brainer.
Torii Hunter has some interesting statistics. Tremendous looking year last year: 31 HR, 98 RBI. Career high .337 ON BASE PERCENTAGE in a season, that's a lower-high than Alfonso Soriano, who has more power and speed and who is notorious for not getting on base. So I don't initially see him as a great fit on the red sox just based on philosophy.
Next comes the role of Jacoby Ellsbury and how acquiring a player like Jones, Hunter or Ichiro would effect Ellsbury's role with the Sox. I think ORS is right in that Manny would move. I imagine Crisp would move too, but in losing Ellsbury they would be losing a guy who could be as good as Torii Hunter but who is younger and cheaper.
That said, I like nearly everything about Torii Hunter. He seems to be a real class act and I always loved how he played the game. I don't exactly feel the same way about Andruw Jones, although he is largely pretty quiet and appears to be less of a bonehead than he was at 19 (go figure) when we were all introduced to him. He has quietly matured into a very, very good player (he has Sheffield power with Hunter defense). Ichiro, I think, would be a good defensive patch at CF--a position I especially don't like patching. You don't put a 2B at SS, you don't put a 1B at C and you should think twice before making a RF a CF. We all know Ichiro has tremendous speed and a great arm, but having watched him a little bit playing for Seattle I don't think he particularly likes playing CF... certainly not the same way that Jones and Hunter do. I thought his stated preference was RF..??
If the Sox were to get Ichiro I would put him in RF where his speed and arm could make him the most well-suited body/player to play RF that Fenway has ever seen. Amazing speed with Dewey's arm. I would trade Manny (even at a loss of $ for one season) and move Drew to LF. I would platoon Crisp and Ellsbury in CF for one season ('08) after which I think Ellsbury would have won the positon hands-down. Crisp will move on. Pena should be dealt after this season or converted to 1B if his power develops like it should. All of this is assuming we get Ichiro.
I don't see another position for Mr. Jacoby Ellsbury. I think it is CF or bust. He lacks the power to justify moving his defense to a corner, and lacks the arm to play RF anyway. I suppose there is a chance that Ellsbury ends up a super-sub with the sox until he's 26 or 27 when he gets traded or something. That speed off the bench and ability to play defense adequately in all three positions would be useful.