The Burley Travoy is an urban bike trailer system that lets you easily take all your gear with you. Pull the trailer behind your bike and then bring it with you when you arrive!
Bike trailer for a kayak.
Bike Kayak Trailer I dunno that i would ever build this, but it is a great idea
Morgan Cycle Shadow Aluminum Trailer Bike Extra Coupler
Bike trailer DIY
DIY PVC Bike Trailer. This I like, its lightweight but wouldnt stand up a lot of heavy use.
Bamboo bike trailer
DIY Bike trailer hitch