The River Guide

Check out this great new resource for white water boaters, The River Guide.

..."we are aiming at mapping as many rivers as possible. The site is meant to 
be a tool for kayakers of every level so even class 1 and 2 rivers are welcome 
on the site."

Here is one good example from The River Guide Founder 
Anton Immler: the Brandseth River in Norway. He talks the viewer through 
the lines in the river and it seems like this could be an amazing tool for 
paddling everywhere.

Anyone can enter a trip, and the site even has a forum component.