WikiTree - The Family Tree of Humankind
I just found out about WikiTree by reading this post at GeneaBlogie. Here is a description of WikiTree from their website:
The primary goal of the WikiTree Project is to provide a central place on the Internet for kin information about all people we know ever lived. WikiTree automatically constructs bloodline trees, and will result in the gradual emergence of global family forest of humanity. It might seem a huge undertaking, but in fact it is not. There is very little information that needs to be entered about any person - just their name, names of his/her children, plus birth and death data; other relations can be inferred! WikiTree uses open-source software MediaWiki - the same that is used by Wikipedia and other WikiMedia Foundation projects.
WikiTree was started on April 26, 2005 and already has almost 33,500 pages as of today. You can go to their site to search for surnames in your file, or you can decide to add people to their site yourself. I registered and was able to add about 6 names all in 10 minutes, so it's very easy to use. I'm curious to see how this "Family Tree of Humankind" will look in a few years once genealogists around the world start adding their names.