Wikipedia celebrates 300,000 entries today, and that’s just in English.
There are 717716 total pages in the database. This includes “talk” pages, pages about Wikipedia, minimal “stub” pages, redirects, and others that probably don’t qualify as articles. Excluding those, there are 300241 pages that are probably legitimate articles. There have been a total of 4992922 page edits since the software was upgraded (July 20, 2002). That comes to 6.96 average edits per page.
I doubt that since the web was born, there has ever been an effort that has added more value to it than Wikipedia. As a growing repository that’s attempting to capture all human knowledge, it’s a pretty amazing resource. If you’re looking for a project to support financially or with your development efforts, Wikipedia is certainly a worthy endeavour.