PocketWizard Plus III Pocket Wizards are the triggers you are going to use to fire your flashes wireless and get them off your camera. There are a lot of other cheaper options online but you might as well buy the best now because eventually you are going to want these. The best part about the Plus IIIs is they use standard AA batteries and they are the industry standard if you ever need to replace them or rent them.
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Manfrotto Fluid Video Monopod w/head We are not huge fans of carrying tripods around at weddings. For photography they aren't necessary but for video you will want to stabilize your camera as much as possible. In 90% of situations, a good monopod will work well for video. These also double as a nice stand for our "light on a stick" setup as well.
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Pelican 1650 Bulletproof Case Buying your first camera case is always difficult and the process really never ends. This is our favorite case because it is practically indestructible, and it protects everything from the harshest of environments. When you open it you can see everything clearly and you need to make sure you buy both the accessory pockets and the dividers so you can maximize the storage. Unless we are hopping onto a flight, all our gear stays in this Pelican Case!
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Lowepro Pro Roller x100 Before I got one of these, I knew I always wanted a roller bag. Now that I have one, I can't see how I went so long without one. This is a tough, rugged and versatile bag that really does everything you can expect from it. Want to use it for regular luggage? Just take out all the inserts. If you have to travel a far distance for a wedding, you're in luck because it's also carry-on approved!
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Sandisk Compact Flash Cards Buying memory cards is probably the most boring part of investing in photography but it's also one of the most important investments you can make. We personally use only Sandisk cards since we've never had one fail us ever. We also subscribe to the thought that having a few really large cards that remain in our cameras throughout the entire day is much safer than having multiple smaller cards that can get lost or reformatted when changing cards out throughout the day. You probably want to pick up a Firewire CF reader as well for quick transfer to your computer.
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Eneloop Rechargeable AA Batteries If you google the best AA rechargeable battery you will find tons and tons of reviews on the Eneloop hybrid batteries. They are great for a number of reasons but we love them mainly because unlike other batteries they do not loose their charge when sitting in your bag. So when you pick up your pocket wizards or strobe units, you know the batteries in them are going to work right away without having to charge them. Buy these in bulk to save the most money.
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Cinevate Atlas 10 Slider To get really fluid video footage, we use this Atlas FLT by Cinevate. It's built like a tank and glides effortlessly. We have used many many sliders over the years and they always fall apart or fail to maintain a fluid movement. If you want the best portable slider money can buy, this is it.
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Manfrotto 190xpro Tripod Legs Don't make the same mistake we made by first buying a cheap flimsy tripod thinking that the nice ones are overpriced. The Manfrotto legs are built like tanks and when you need something to support a heavy camera you need it to be sturdy and heavy itself. We use this tripod primarily for filming video clips.
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Manfrotto 503HDV Fluid Head The Manfrotto 503 HDV is the most intro level fluid head around but it really works very well. We have replaced all our other tripod heads with the 503 for both video and still shots and it's built like a tank. If you plan on doing any panning with video you are going to need to purchase a fluid head. Of course there are some really nice alternatives but they can start getting very very expensive. Just make sure you buy some extra plates when you do buy one of these.
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Who do you use for USB delivery, if you do that? (printing on usbs, packaging, etc.)