How do I find some good iPad/iPhone apps?
Go here!
How do I look up a common name for a chemical
instead of it's IUPAC name?
ChemFinder
How do I find safety data (MSDS) for a chemical?
Vermont SIRI Material Safety Data
Sheets (MSDS) library 
Indiana University
Dept, of Environmental Health and Safety (MSDS & disposal info)
Where can I find a good chemical dictionary?
Chemistry
Explorer - a comprehensive chemistry term dictionary
Dictionary
of Biotechnology at Indiana University
Where can I find the history of the discovery
of elements?
Element
Histories
WebElements
CRC Handbook of Chemistry and Physics
"Discovery of the Elements" by Mary Elvira Weeks
Merck Index
Where can I find a periodic table online?
Periodic
Table - Chemical
Elements.Com
Periodic Table - Chemicool
Periodic Table - Los Alamos
Laboratory
Periodic
Table - Chemical Society (Very visual... uses Shockwave)
Periodic Table - WebElements
(history
of elements too!)
