Hazardous Materials Emergency Response Guidebook (ERG 2008) on your iPhone-- FREE
The paid app is pretty darn cheap, and with it, you get the 2012 ERG.
Search for Hazardous Materials information and response guides by name or placard number. Access thousands of records, and all guides available from the DOT Guide Book.
Search by material name, UN ID, or jump directly to a response guide. Water reactive materials are identified as such. Toxic by Inhalation gases are also associated with each material where applicable.
In addition, review response instructions, and guidelines, identify Rail and Road Cars by photo identification.
Placard Plus contains all emergency response contact phone numbers - tap to dial (iPhone only).
Placard Plus contains virtually ALL information contained in the DOT Guide Book (Glossary of terms is the only thing missing)