How large is your memory card?

Wow, David, I have never had to use any larger than a 4 gig card for any assignment I have had. You can shoot most weddings even on 4 gigs. My Canon can shoot a burst of 8.5 fps, but I have never shot that many frames without a pause. Do you shoot a lot of sports? I guess I am old school. Heck, they had to pry my film cameras out of my hands and scream what date it was in my face before I would let go of my Mamiya 645! But I have acquiesced to the digital age and have two good DSLR's now (I still shoot film when nobody is looking). I remember when pros were still using film and if you were subcontracting for another studio you were lucky to be sent on your assignment with even 4 or 5 rolls of 24 exposures! Somehow we always came back with all the shots we needed, done well. Of course now the style of shooting is so vastly different. I was classically trained using a traditional style. Now the photojournalistic thing is the rage. I am trying to catch up. My days as a photojournalist helps a lot, but it still takes some getting used to.

I guess you are using a full-frame EOS: the elderly 1D Mark II and the Mark II N are the only Canons I know rated at 8.5fps (even if the MKII never quite got there). That series had 8megapixel sensors, so were less demanding on storage than some current compacts. I do shoot a bit of wildlife, but not much sport. But at a wedding, I frequently fill 8GB cards. I was stunned the first time I ran out of space on a 4Gb card, then a second, and the reception only half-way through. I had to "steal" a card from my assistant (she was using an 8Mp Canon and 2Gb Cards. RAW files and worse, RAW+jpeg gobble up space. My EOS 50D is a 15Mp beast, and my 7D is 18.1Mp. I was fine with smaller cards until I upgraded my 20D!