builder.blender.org - Development Versions of Blender 3D - These versions have the latest features, but may be unstable. You can help test them and report any bugs.
NOTE: You should be careful about using development versions in production projects.
https://cgcookie.com/ - CG Cookie teaches how to use Blender 3d, Unity, and sculpting. I recommend starting with their 2d basic art concept courses. They have the individual courses available, but they've organized the course into "learning flows" that track...