This one isn't much of a surprise, and there's probably absolutely nothing concrete behind it, but the Miami Herald posits a trade
between the Yankees and Marlins to send Miguel Cabrera to the Bombers to replace A-Rod at third. Going south would be Melky and "young pitching." MLB Trade Rumors
fills in the blank and says that young pitcher would have to be Phil Hughes, because they think the Yanks are higher on Joba and the Marlins wouldn't settle for Kennedy.
My take: I've said it before and I'll say it again, Melky, Cano, Joba and Hughes are the untouchable 4 on the roster and in the system. You may have to touch one of them to land a potential hall of famer, like Cabrera, but you can't trade two.
The deal makes sense for the Marlins because they are the cheapest sons of bitches on the planet, and Cabrera will probably make $11M in arbitration this season, and in the $15-$17M range next year (2009).
The main drawback with Cabrera is his expanding waistline. The slugger has continued to pack on the pounds, and he's in danger of eating his way out of the league. That being said, he's one of the best hitters in the game, and he's only 23.
Update: I've added a page to the Yankees spreadsheet for trade rumors, you can download the updated spreadsheet here