You may have heard.
Let's take a look at the common discussions:
Mark Feinstein and Bill Maddon hear that trade demands would start with Clay Buchholz and Casey Kelly.
John Sickles rated Kelly a B- before the start of 2009, roughly 11th best in the Boston system. He's an interesting prospect in that the Red Sox have allowed him to work as a shortstop (.222/.302/.340) and a pitcher (95IP, 65H, 16BB).
Buchholz is as much a question mark as Joba and Hughes. He turned 25 in August (a year older than Joba and just shy of two years older than Hughes). He started 16 games, averaged 5.2 innings per start, a 1.38 WHIP with 6.7 K/9.
The Yankees could beat that package almost by mistake (Hughes+Jackson).
Not only would that be the steal of the century, it would be the first time in history a team made a trade before at least having the specter of the Yankees involved.
Cashman hasn't heard what his budget will be yet. Until he does, take no Halladay rumor seriously.