I thought Crede would have a breakout season this year. I don't mean 'become a star' breakout, just .260 ba, .330 obp, .450 slg, something like that, which is where I thought he would consistently be. He has the ability to make great defensive plays, and for that alone I still enjoy watching him play.
But...he's been a huge disappointment, and he hasn't shown an ability to learn from his mistakes. Last year was a sophomore slump, this season should have been the rebound, as he figured out how teams threw to him. Instead, the pitchers have found even a few more holes in the zone (holes in the o-zone, as wide as the holes in the ozone, there's got to be a way to work that in... ). Maybe he will still improve -- his k/bb ratio got better over time in the minors. Then again, his ba was never this poor.
Personally, I would like to see the Sox shop around. I like Koskie, although he doesn't k much less than Crede. He draws a lot more walks, has a good obp. But he would have to be priced appropriately, since you can't count on a full season.
I wouldn't expect much for Crede, but you could probably get a role player or 1 or 2 low- or mid-level prospects.