Last year I realised that it was possible to build Flash games using free software - The free IDE FlashDevelop and the free Abobe Flex 3.3 SDK. I finished about 80% of a little flash game, re-using graphics from an old Acorn Archimedes game I wrote about 15 years ago.
I was going to add proper menus and music to this, but a year later I still haven't so I guess I'll just abide by the 80/20 rule and post it anyway.