Drop Gorzelanny for Penny right now. Penny is pitching lights out and unlike last year (when he fell off the map in the second half) he has a whole new approach to batters which IMO will sustain his success all year. Penny whould be owned in all leagues right now. No questions asked.
Dropping sanchez for Victorino is a good move as well.
I would drop Wheeler for Cordero as well. Wheeler is struggling and Lidge is breathing down his neck. Cordero has better stuff and job security. I just dropped Wheeler for Capps if that tells you anything.
I personally like Glaus over Zimmerman at 3rd, but his injury potential is risky. If you can put up with that and have a backup for him that is a move to make, although marginal.