Ed. note: If you're inspired to tackle a DIY project this week that involves computers or small parts, reader delphinus87 has a simple tip on keeping tiny screws together with an office supply standard.
In case you ever have to take something apart with many little screws, like a computer, I find the best method for keeping track of those various screws is a simple index card.
Just puncture the card with as many screws as you like. You can also draw boxes around similar screws and label them as "Power Supply", "DVD Drive" or whatever function they have to label them further. I find this better than the old stand-by of a bunch of bowls. Granted, there are better solutions for larger screws and bolts, but for the little ones in a PC, this method is perfect.