[0] No longer there but still think of GU very fondly
Using an article such as "the" in a brand typically indicates a desire to lay stake on a common noun as a proper noun, or at least the definitive instance of the noun. It often doesn't make sense when your brand is obviously a proper noun or otherwise unique already, but I suppose there's plenty enough newspapers having a variant of "Guardian" in their titles to warrant a push to definitive-hood.
Edit: A friend also pointed out that "guardian.com" is already taken by another established organization. I think that trumps my silly grammatical analysis :P
Will be interesting to have a look and see how well or not the in house seo/dev team have done the migration
In any case, all the cool kids use gu.com
Sad to see the Guardian go to a .com
But the Guardian is trying to reach more than that audience, and I'm sure there are lots of "Fox-News Americans" who will scorn the .uk and still find .com to be professional. They have a sense that .com is normal, and that other TLDs are inferior.
Yeah yeah..!