I used to use the .com addy all the time. I only use the .info one now though primarily because I had trouble with the .com address. But I know for a fact that sometimes DNS resolution here simply doesn't work. The other day, I couldn't access alexa.com. I know darn well their servers are working, so it must be my DNS resolution.
Speaking of which, I love the comment / question you hear from people sometimes, "The internet isn't working".
Makes me laugh. It is equivalent to saying, "None of the millions of networked computers on the planet work." ... oops.... there again I go blathering with another brain-fart....