If you can get solid prospects, I'd trade Escobar, Street, and Smith. What sucks is we don't really have many valuable pieces to deal since the team is so awful, those three are about it. Obviously you can't trade Trout, and I think Calhoun is another guy to build around.
Maybe Shoemaker, but I feel like he would net more in in offseason deal if he can finish with some strong numbers, or he also might be someone to keep if he's truly figured it out. Santiago I also feel like we should wait, you don't want to sell low on a starting pitcher.
Hopefully Lincecum can bounce back from his last start, if so he's a guy to deal at the deadline.