Find out how to make everything.
Make magazine's web site. They have a project area but it's not nearly as good as instructables. The one nice part is you can find all the projects from the past issues.
Run by the mythbusters!
Ok yes it's loaded girly stuff but you can also find woodworking tips and plans on this site.
Great plans that are simple to follow and free.
Spend far to much time laughing at this site.
LED wizard that will show you how to wire up your LED's and what resister to use.
piston timer http://imgur.com/a/AmPF6
drop down voltage