There is no doubt that when .CO was launched, it had tons of support and a pretty big push. It's only an "m" away from .com. Many domainers saw this as a chance to grab the some of the generic gems that were already snatched up in the .Com market. As I continue to talk to end users, I'm finding that many of them also see this as the opportunity to grab some keyword domains that support their line of business as well.
As reported by The Domains a couple of days ago, GoDaddy will be airing a 30 second SuperBowl commercial to feature the .CO TLD. That's a pretty big deal. GoDaddy is a huge name in the consumer market and a SuperBowl commercial endorsing a TLD is going to have some influence. Additionally, I noticed that Network Solutions has once again bumped .net for .co when searching for domains. This time, they even draw a little more attention to it with an info balloon.
I haven't invested much in .CO up to this point, but it's worth considering. If you hold an interest in a particular area, it might not be a bad idea to check for those names before the SuperBowl. Sure many of the great .CO names have been snatched up, and it's still a country code TLD, but there are still many available and it's picking up some traction. I'm not suggesting you sink a fortune into the TLD, but maybe think about one or two you'd like to add to your collection if you haven't already. I'm still not totally bought in to it, but if you've been on the fence, now is probably a good time. Besides, it pays to diversify.