Neil Patel has taken an initiative to create a list of all the domain names that Google owns. Wow, a long long list and many more to come along the way. He is missing some along the way and I see friends at Digg are helping him create a complete list.
I hope Neil makes an effort to constantly update this list if it is not too much to ask for ;).
Now can anyone be bothered to dig out a complete list of domains that Microsoft owns?