Basic info about space junk: http://orbitaldebris.jsc.nasa.gov/faqs.html

Detailed info: http://www.orbitaldebris.jsc.nasa.go...5_Document.pdf

NASA identifies Top Ten space junk missions: http://www.networkworld.com/community/node/64242

Tiny cube will tackle space junk: http://news.bbc.co.uk/2/hi/science/nature/8590103.stm