Conventional baseball wisdom is that you never ever trade within the division. Luckily, I love the unconventional but smart move when it comes to baseball.
What about Mike Cameron? The Yankees have been after him hot and heavy, but shockingly are demanding that the Brewers eat some of his salary (or take all of Kei Igawa's salary).
Want a big RH bat? Cameron makes lefties cry; in the past 4 years his OPS against LHP has been under .900 once. Want to improve the defense? While he's no longer one of the best CF in the game he's still awfully good - JinAz thinks his defense is about as valuable as Dickerson's; UZR had him as the 2nd best CF (the Chone projections are down for some reason). Want a decent value? He's only under contract for '10 at $10M.
Throw Bailey or Arroyo at them (they desperately need pitching; Bailey would offer significant salary savings, but Arroyo might enter the season as their #1 starter). Even if it would take another middling prospect, it would make infinitely more sense than trading for Dye.