OK, just for fun, here's my "usage" on my last wedding:
24-70L: a good 85%
100 macro: 2 shots...less than half a %
70-200L IS: 5%- just for "down the aisle"
35L: just under 10%- perfect for "couple" portraits
As for that "noise" issue- I didn't have the courage to use a 28-75 for my weddings...just didn't cut it in low light. As for "body" noise- the 20D is pretty loud when it's clicking away. I'm very much looking forward to my 30D. Played with it again in Circuit City the other day. It's half as loud as the 20D...just a nice muted click.

