Whatever the reason for the Windows Phone Marketplace had for not playing nice earlier, the problems appeasr to have been resolved. We've been able to access the Marketplace online as well as from our Windows Phones.
Even the links to Marketplace apps are behaving as they should. The glitches we've experienced today as well as over the weekend could simply be the result of Microsoft working under the hood.
None the less, all appears to be corrected and we hope everyone is now able to access the Marketplace. Sound off in the comments if you're still having problems.