5d vs. 7d
I still love the 5d for its shallow depth of field, but the 7d is just so much more production ready. i'm glad canon finally released the 24p firmware for the 5d, but it doesn't solve the downres'ing to SD when you hit record (in addition to not being able to split the signal). for stills work, though, the 5d can't be beat. just being able to carry over lenses from a 35mm perspective is key. You could leave your house with a 24-70mm 2.8 and be fine on the 5D, whereas you'd need 2 lenses (wide and standard zoom) on the 7D to keep yourself versatile.