found some useful info on the exxonmobile site on LPG

-Characteristics
http://www.exxonmobil.com/AP-English/about_who_profile_lpg_characteristi...
-Why use LPG
http://www.exxonmobil.com/AP-English/about_who_profile_lpg_why.aspx
-LPG safety tips
http://www.exxonmobil.com/AP-English/about_who_profile_lpg_safety.aspx

look forward to a lively debate from home users, and also those who are interested in chemistry/physics/the environment/ etc. in exploring the pros and cons