Just a few details that I could add, i guess:
The couple had been shopping for photographers in their area and the ones they wanted were booked and the ones available they didn't like their work vs. their prices. They had at this point decided to not have a photographer and were going to have the bride's mother catch everything on a point and shoot. I basically heard about the situation through a friend of a friend type thing and offered to shoot the wedding for free in exchange for the experience. They understand that I am not experienced, and vs. their previous plan of having the mother of the bride running around with a point and shoot they opted to let me shoot the wedding. My fiance is working on this with me with a digital point and shoot just in case I miss something important. We eventually will be doing this working as a team with 2 good cameras once finances allow.
I have 5 GB memory, 2 2GB cards, 1 1GB card and a portable harddrive (40GB) so I can move images to the hard drive and format while I'm working with my second 2GB card. I have 2 extra batteries. I have only 2 lenses and not the best possible for the situation. I have a 18 - 50mm/f3.5 and a 50 - 200mm/f4.0. I am extremely new to SLR cameras. I've used an SLR in the past but without having any clue what I'm doing. I understand SLRs in theory because I've been reading books constantly since I decided this is what I'm going to do, but I didn't actually receive my camera and lenses until yesterday. I'm just trying to familiarize myself enough with the controls so that I don't stumble too much if the ISO needs to be adjusted manually, etc.
As far as the wedding goes it will be in a well-lit church, and the reception will be well-lit. I plan on catching as much as I can outdoors at the church, and I'm preparing worst case scenario to have low light at the reception. I've been reading about bouncing flash, and adjusting ISO, etc. for low light reception type scenarios, but it is all theoretical for me at this point. I'm at my day job now and will have very little actual opportunity before the wedding, but I plan to play around in different lighting situations to see how pictures come out, etc.
I'll be shooting in RAW + Fine Quality JPEG. (20MB a shot, ouch)
I'm just now really beginning to catch on to the histogram, but it seems really really useful. Still learning how to read it.