Ab Initio and Density Functional
Links
Sicklist Database
http://srdata.nist.gov/sicklist/
List of molecules for which various quantum chemistry methods give poor agreement with experimental results. Also recommends alternative computational methods that give better results.
Simplified Introduction to Ab Initio Basis Sets. Terms and Notation
http://www.ccl.net/cca/documents/basis-sets/basis.html
An article by Jan K. Labanowski.