After deciding what style of cloth diapers you are going to purchase (or register for), you should look into the accessories that help the system run a lot smoother. None of them are 100% necessary, and a lot of them you can make yourself or find a close alternative.
There has to be a designated spot for the dirty diaper before it's washed and there are a few options to choose from. One is called a wet bag. Wet bags can hang from a hook and store about 16-17 diapers. They have a zipper on top where you put the diapers in. Then, when you are ready to wash, take it off the hook, hold it over the washer, and unzip the bottom so they all fall out. Throw the wet bag right in the wash as well and you are golden. Wet bags come in a medium size (holds 8-9 diapers) and a small size (holds 1-2). Most moms carry a small on in their diaper bag. Several brands of diapers also make wet bags. The price can range anywhere from $9.00-$30.00.
Pail liners do essentially the same job as wet bags, except you put them in a 13 gallon trash can instead of hanging it. These are also designed to be thrown in the wash with the diapers. These tend to be a little cheaper than the large wet bags, rangin from $5.00-$14.95.
We didn't register for one of these because I thought the water would spray everywhere. I'd love to hear what other people think of them, though. A diaper sprayer looks like a shower head that hook on to your toilet. It is used to spray off a messy diaper into the toilet before putting it in a pail liner or wet bag. BumGenius and Fuzzibunz make sprayers that cost about $40. I'd heard that if you really want to try these, you should just buy a sprayer that you would use on your pet for about $10, and it works just the same.
I talked about these in the Just What I've Been Looking For post. They come in a roll and you rip them off to set in the lining of the diaper to catch and contain the mess. Just flip the diaper upside down over the toilet and the whole liner comes out. The best part - you flush them =) I bought a roll of 200 GroVia liners for $10.
Other accessories include cloth wipes and spray for the wipes. Those are explained in Wipes - Cloth or Disposable.