Wikipedia, the community written and reviewed online encyclopedia, is seven years old today.
I think its value in collecting human knowledge is immense. (For as good as Google can be and for how much I use it, I'm a little chilled at its thrust towards amalgamating all data.) But it is more valuable being a model of user-level production of resources, its openness at the corporate leadership level and even its fund raising ability -- many, many small gifts rather than a few very large ones -- makes this a day to celebrate.
How to celebrate? Make a financial contribution, an article edit or both.