Another Game to Analyze

Thanks again, Daleman, for posting the first game. I'll go next. Here is a game I'd like to have help thinking through. I felt like I was playing pretty well, building up my forces to bear on his king in the corner. But something didn't work, and I ended up minus a minor piece, enough to let him whittle away at my pawns in the endgame. Is there a single mistake here that any of you can see? Sure would appreciate your help.