Biographies of Women Mathematicians — an online database of female mathematicians and their contributions.
MacTutor History of Mathematics — a treasure trove of information about mathematicians and their discoveries.
Scientist Biographies (Wolfram) — an online database of scientist biographies.
Mathematics Quotation Server — look for famous quotes by famous mathematicians … a nice touch to any assignment!
The Story of 1 — a humourous look at the history behind the numeral “1.”