I found some interesting links that I'd like to share. Please share your tips or URLs on this subject if you have any.

DIY Ring Light Tutorial:
http://jyoseph.com/diy-ring-light-tu...-and-improved/

DIY Light box for product photography
http://jyoseph.com/diy-light-box-for...t-photography/

DIY RingLight for portrait photography
http://jyoseph.com/diy-ringlight-for...t-photography/

DIY Ghetto Gel Light
http://jyoseph.com/diy-ghetto-gel-light/