The Johnstone Laboratory
Medicinal and Fundamental Inorganic Chemistry Research Group
WRITING
Nomenclature of Inorganic Chemistry (IUPAC Red Book)
Chemical Abstracts Service Source Index (CASSI)
GENERAL CHEMISTRY
CRC Handbook of Chemistry and Physics (searchable)
IN THE LAB
Concentrations of Aqueous Acids and Bases
SYNTHETIC CHEMISTRY
The Schlenk Line Survival Guide
Glovebox Videos (Vacuum Atmospheres)
Purification of Laboratory Chemicals
NMR SPECTROSCOPY
Hebrew University of Jerusalem NMR Facility (great general NMR resource)
University of Ottawa NMR Facility Blog (lots of information in the archives)
Spectral Database for Organic Compounds (SDBS)
Hans Reich's NMR Spectroscopy Course
A Glimpse Inside an NMR Spectrometer (courtesy of JEOL USA; high res pictures can be found at the bottom of the linked page)
CRYSTALLOGRAPHY
Structure Access: Cambridge Structural Database (CSD)
Inorganic Chemistry Structural Database (ICSD)
Core CIF Dictionary: International Union of Crystallography (IUCr)
International Tables for Crystallography
Kevin Cowtan's Picture Book of Fourier Transforms
(or jump straight to Animal Magic with the Fourier Duck and Fourier Cat)
Kevin Cowtan's Interactive Structure Factor Tutorial
Refinement of Disorder with SHELXL (a tutorial by Peter Müller, MIT)
COMPUTATIONAL CHEMISTRY
Computational Chemistry Comparison and Benchmark DataBase
CELL BIOLOGY AND MICROBIOLOGY
BioNumbers - Database of Useful Biological Numbers
JOHNSTONE RESEARCH
FOR FUN
Stephen Fry's Great Leap Years (this section is not all about silliness)
Prof. Andy Jupp's Cryptic Chemistry Crosswords (if you want to cry)
Glossary of Archaic Chemical Terms