What debouncing technicques do you know?

[skimask]

There are so many ways to debounce a switch or bit so I was just wondering what other ways there are to debounce? If you're willing to share your debouncing technicque then post it here.

Google gives me over 167,000 hits on switch debouncing.
And the 20 or so that I looked at had a load of good ideas.
Have you checked ANY of them?