Suggest using this thread for links to "how to" chemistry sites.

http://chem.chem.rochester.edu/~nvd/

This site "Not Voodoo" is great for it's practical information about running reactions.
The list of rookie mistakes will help you feel a little less stupid for doing things like forgetting to close your sep funnel.

The list of "fire vs Explosions" is particularly helpful for identifying risks - something I don't see a lot of in home chemistry sites. 
http://chem.chem.rochester.edu/nvdcgi/pyrophoric.cgi

Pl Find here with a list of 32 Free Online Chemistry Databases

   1. PubChem
http://pubchem.ncbi.nlm.nih.gov/
   2.ZINC
http://blaster.docking.org/zinc/
   3. eMolecules
http://emolecules.com/
   4.CHEBI
http://www.ebi.ac.uk/chebi/
   5.NIST Chemistry WebBook
http://webbook.nist.gov/chemistry/
   6 .BioCyc
http://biocyc.org/open-compounds.shtml
   7 ChemExper
http://www.chemexper.com/
   8. Compendium of Pesticide Common Names
http://www.alanwood.net/pesticides/
   9. NMRShiftDB
http://nmrshiftdb.org/
  10. Chemical Structure Lookup Service (CSLS)
http://cholla.chemnavigator.com/cgi-bin/lookup/search
  11. DrugBank
http://redpoll.pharmacy.ualberta.ca/drugbank/index.html
  12. Wikipedia- Wikipedia
http://wikipedia.com/
  13. ChemDB
http://cdb.ics.uci.edu/CHEM/Web/
  14. ChemBank
http://chembank.broad.harvard.edu/
  15. National Institute of Allergy and Infectious Diseases Database
http://chemdb2.niaid.nih.gov/struct_search/default.html
  16. National Toxicology Program
http://ntp.niehs.nih.gov:8080/
  17. NIST Chemical Kinetics Database
http://kinetics.nist.gov/index.php
  18. Computational Chemistry Comparison and Benchmark Database
http://srdata.nist.gov/cccbdb/default.htm
  19. IUPAC-NIST Solubility Data Series
http://srdata.nist.gov/solubility/
  20. SOLV-DB
http://solvdb.ncms.org/
  21. NIMH Pyschoactive Drug Screening Program Ki Database
http://kidb.bioc.cwru.edu/pdsp.php
  22. Kyoto Encyclopedia of Genes and Genomes (KEGG)
http://www.genome.jp/kegg/
  23. BRENDA
http://www.brenda.uni-koeln.de/
  24. Biochemical Pathways Database
http://www2.chemie.uni-erlangen.de/services/biopath/index.html
  25. ChemMine
http://bioweb.ucr.edu/ChemMineV2/
  26. Organic Syntheses
http://www.orgsyn.org/
  27. WebReactions
http://webreactions.net/index.html
  28. Spectral Database for Organic Compounds (SDBS)
http://www.aist.go.jp/RIODB/SDBS/cgi-bin/cre_index.cgi
  29. BindingDB
http://www.bindingdb.org/
  30. PDBBind
http://sw16.im.med.umich.edu/databases/pdbbind/index.jsp
  31. AffinDB
http://pc1664.pharmazie.uni-marburg.de/affinity/index.php
  32. ChemRefer-
http://www.chemrefer.com/