Five Hard-to-Kill Houseplants for Your Home or Workspace - Plants - Lifehacker
http://lifehacker.com/5357488/five-hard+to+kill-houseplants-for-your-home-or-workspace
Best Air-Filtering House Plants According to NASA! : TreeHugger
http://www.treehugger.com/files/2009/02/air-filtering-plants-indoors-air-quality-benzen-formaldehyde.php