Eye-Fi

Well, this gadget is very useful for every photographer. It is a SD card, with WiFi module, letting You send Your pictures, without swapping cards between computer and camera.
Some features of this card:

• Wi-Fi Security: Static WEP 40/104/128, WPA-PSK, WPA2-PSK
• Range: 90+ feet outdoors and 45+ feet indoors
• Storage Capacity: 2.0GB (1GB is defined as 10^9 Bytes)
• Power: advanced power management optimizes use of camera power
• Card Dimensions: SD standard 32mm x 24mm x 2.1mm
• Card Weight: 0.1oz.