There are words that I *know* I have problems with: ones that I don't use often enough to recall the proper spelling, or haven't developed the proper muscle memory for: "vacuum", "Van de Graaff"(probably), and a few synohomonyms like "separate" and "seperate", "practise" and "practice"; say a double-handful all told.
The wordlist for the Minimalist Spellchecker is entered and updated by the user. Actions may include an autocorrect confirm in the case of a "Van Der Graff" or "vaccum", or pop up a user-supplied reminder/definition as in the case of "practise" and "practice".-- FlyingToaster, Jan 04 2011random, halfbakery