Making

• instructables
• Make and Craft mags
• etc.

• http://chemistry.about.com/od/crystalrecipes/a/grow-bismuth-crystals.htm

Metal

• http://www.instructables.com/id/Electrolytic-Rust-Removal-aka-Magic/

Sewing

• WP: Darning

3D Printing

• http://www.shapeways.com/
• http://www.thingiverse.com/thing:8595

• http://richrap.blogspot.ca/

• http://marcuswolschon.blogspot.de/2012/09/occupy-thingiverse.html

Electronics

• http://tindie.com/
• https://www.circuitlab.com/

Flying

• http://diydrones.com/

• http://makerplane.org/