Death Row
I first learned about the concept of sentencing software to Death Row in Gina Trapani's book lifehacker: 88 tech tips to turbocharge your day. I believe it started here.
I have couple of folders that get a fair share of abuse, one is a dev folder, it's where I put all those one off scratch apps that are created usually to test out one thing. usually poorly named. Those pile up fast. So implemented a Death Row folder. It's awesome. grab every project that's older than say a month, or named something like craptester or crackmonkey or MvcApplication1, MvcApplication2, MvcApplication3, etc, and sentence them to the Death Row folder. Where they sit for say a month? you choose. Then you delete them. Keeps the clutter down.
My other folder that gets abused is my svn folder, where i checkout crap from every place that lets me. Now i'm in the habit of Death Row, so I can keep that folder nice and clean.