One of my favorite site is Instructables.com , a site dedicated to diy projects. Users post there projects with detailed how-to instructions on how they did their projects( hence the name).
Browsing through the latest posts I came across two prjects which were quite interesting and relevant to the permacultural ideal
The first is a "portable" shelter inspired by the mongolian yurt. It rather simple to build and given our climate i can see many worth while applications.
The second are a few ideas you can use to grow your own organic fruit and veg. There is nothing more sadisfying than eating something you have grown yourself.
I hope you find these links interesting :)