To get your .CO domain, you could use Network Solutions:

... or GoDaddy, for almost 1/4 the price:

I never understood why someone would choose Network Solutions over GoDaddy, simply for registering a domain. I know the hosting features differ for both services, but for registrations alone, it's a no-brainer.

Other than price comparisons, this top-level domain intrigues me - it's so close in appearance to .COM, it's almost indecipherable from a visual perspective. Also, I often leave off the "M" by accident when typing a domain, so now sites should be able to capture that mistake and direct me to the appropriate page anyway.

It also might be useful for domain + TLD words (domain names that spell a word while including the TLD/extension), such as wil.co (example I just thought of).

Finally, I can imagine the state of Colorado is very happy about this - free branding/recognition with every domain registered! ;-)