Biological buffers - tips and buffer tables
Buffers at wikipedia - New! - Story of the Beckman pH meter
Good buffers at wikipedia - Good reflects
Picture of Norman E Good, developer of biological buffers
Sigma's buffer page - Properties of reagent grade acids and bases
Sigma buffer tables (tris, phosphate, citrate)
Research Organics buffer table - Citrate buffers
Jovin buffer table, Sorenson's buffer table - phosphate buffers
Caution on phosphate and citrate buffers
Electrophoresis buffers, Tables - Misc. buffers - Exponent tables
Spreadsheet titration - New! Properties of borax (primary pH standard)
Laemmli buffers - weigh and pour recipes (simple, reproducible)
Ammonium acetate as a buffer
The glass electrode - a caution
History of acids and bases - The pH scale
A history of acidity, GCSE notes on acids and bases
Making buffers, Buffer "tricks"
If you work with biological buffers, they're well worth understanding. Spreadsheets offer convenient calculation and visualization. I recommend Chapter 8 of Robert T Scopes' Protein Purification, 2nd ed Springer Verlag, 1987 for a brief, but extensive introduction.
For a thorough and classical treatment of acids, bases and buffers see Biophysical Chemistry, Edsall and Wyman, Academic Pr, 1958
For buffer pKas and recipes see Buffers for pH and Metal Ion Control, D.D.Perrin and Boyd Dempsey, Chapman and Hall, 1974 (out of print) - find a library which has it.