hitting seems fine. in fact, except for glaus, i think you've gotten stronger in hitting now compared to earlier on in the season.
your pitching is the explanation for the recent slump. losing halladay is huge, as he was basically a guarenteee 1-2 ERA and .50-1.00 whip with at least 7 IP per week. good news with him is that he'll be back soon and he says he feels great. dontrelle willis on the other hand, seems to be on his second half slump again. i doubt anyone would bite on him now, but if you can trade him i think you should.
i think once halladay returns your team will stop the skid.