Other sites with free ramp plans
RickDahlen.com
These are probably the second best mini halfpipe plans on the net.
Rampplans.org
A very large collection of ramp plans resources, particularly useful is the F.A.Q.s and large Forums.
secretwaves.la
Some great documentation on the construction of a 5' mini with a closeout.
totse.com
Lots of writing on building a ramp, also some legal/liability info.
Modular Halfpipe
Good ramp building info
Outta Here - Backyard Bowls
Includes pictures and notes on four bowl projects
freerampplans.cjb.net
Decent step by step instructions for buillding a mini ramp, although lacking in diagrams/pics.
BmxTrix.com
Drawings for many different ramps, including info for cutting transitions over 4 feet.
Ramp Calc
Flash web application for determining dimentions for drawing transitions.
Heckler
Blueprints for various ramps, no instructions.
More Links
SkunkBoy.net - Lots of pics and videos of different Xtreme Sports.buildaramp.com - Buy Ramp Plans