Cameras - I use 2 cameras throughout the day, a Sony FX1 & Sony HVRA1E, both camera's compliment each other very well and both have the ability to film in High Definition. (See the HD extra in the Prices section for more information.) Filming with 2 cameras allows more flexibility when editing and also allows the main camera more scope, especially during the ceremony and speeches.
Sound - Your ears are more sensitive than your eyes, recording clear crisp digital pictures is only half of the production, sound is an all too often overlooked area of wedding videography. I have lost count of the amount of demo tapes I have seen with poor muffled sound during the vows, I take as much care with the sound as I do with the pictures. For the ceremony I attach a small radio mic to the groom and during the speeches I have a mic capturing the ambient sound and a mic placed on the top table with a wireless transmitter attached to ensure the best possible sound recording