Comic book periodic table: http://www.uky.edu/Projects/Chemcomics/
Water density table (PDF file, Adobe Acrobat reader required, click here if you want a free download)
Densities of some common metals:
Naming Simple Compounds: Metal/non-metal; Metal/polyatomic ion; Non-metal/non-metal.
Unit conversions:
http://www.ProcessAssociates.com/process/convert/cf_all.htm
Web elements:
http://www.shef.ac.uk:80/~chem/web-elements/
Chemistry functions:
http://www.stanford.edu/~glassman/chem/index.htm
Have fun!!