Australia
Windows Vista refund or credit? (Australia)
Israel
2008-12-04: Israeli Linux fan squeezes Windows refund out of Dell (more detailed original source from ynetnews.com)
United States
2003-07-30: Strategy for getting a refund in the US (by Steve Qualline, Linuxjournal, 2003)
2010-02-10: ZDnet: Linux users, get your Windows refund today (is this from the US or from the UK?)