Items to keep in your camera bag
Extra memory (CF, SD or whatever your camera uses)
Batteries (for external flash or accessories)
Pre-Moistened Lens cloths - Sam's Club carries Zeiss in bulk
LensPen - www.lenspen.com
Microfiber cleaning cloth
Compressed Air - Costco carries Dust Off
Air Blower - An ear syringe from your local drug store or
Giottos Rocket Air Blower (buy online)
Cotton swabs for cleaning camera - store in plastic bag
Extra UV Protector filter - inexpensive and saves lenses
Gaffer's tape - the ultimate photographers Swiss Army Knife
Spring clamps - various sizes can be used for almost anything
Flash Diffuser - soften the flash