Marketplace was sketchy for me yesterday. Needed to reboot my phone to be able to download. Got some error that "marketplace isn't available at the moment". Only when trying to download certain things though.
Marketplace sort of started to work late last night. One attempt would give an error message a reattempt would work. No change with PeopleHub and SkyDrive. Also apps that use data won't connect at all.
If I turn on wifi everything works. It has to be an ATT problem.
AT&T says that they are upgrading 3 towers in the area. That I should give it a couple days to clear up. If it doesn't, it could be faulty software, but they have never had that problem with the HD7S before.