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.
(I already do this, but since this link spells it out so well for you, I thought I'd share!) Avoid messy dresser drawers by “filing” your clothing side-by-side instead of stacking items on top of each other. See the before and after at Apartment Therapy.