I regularly re-evaluate what I need to carry, depending on the location and type of assignment, and I probably never pack exactly the same way twice. Here is how I packed for a recent wedding:
The cameras, lenses and flashes are made by Canon. How much does all of that weigh? … don’t ask! :-) And, in the car, an emergency gear bag with two more cameras (5D & 40D), three lenses (28, 50 & 85), two flashes (580EX) and even more batteries.