The Envelope System--for budgeting your paychecks and staying on budget. This was actually how I saved up $630 for a computer and $350 for a new aquarium at the same time... then I stopped doing it. Maybe I should start again.
The five-dollar savings plan: Every time you find yourself with a five-dollar bill in your possession, you set it aside instead of spending it. At the end of the year, you use the money you've saved for either a big purchase or to do something you wouldn't normally spend the money to do.
Ink Cartridge Low? Not true... this totally works, my printer stopped printing, saying there was no ink, I reset the cartridge and then printed 50 more documents and the ink still hasn't run out!!! good.