Line Repair products such as the Microhook braiding tool, linesets, leader line and replacement pigtails.
 

Replacement bladders and valves from Airtime to fit just about every make and model of kite out there.  Tear Aid bladder patches for quick fixes. 
 

Repair Kits to fix everything from your kite to your harness from KiteFix and Kiteboarding.com.  These kits rock for trips or just to save a session at your local beach.  Every kiteboarder needs at least one of these. 
 

Sail tape and dacron tape to make quick kite repairs and Tear Aid bladder patches.