I am having this exact same problem.

Is the freaking web service down?

EDIT:  More details.   I apparently have an account registered with this email, but it does not show that i own Sins of a Solar Empire.  (it is registered for Galactic Civilizations 1.)  When i type in the serial number from the BOX THAT I AM HOLDING, it says that this is not the right serial number for this email...   SO, the Question Is:  if there is no SoaSE key in my email, then why can i not put in the one on the box that i bought?  If there IS one in my email, then WHY CAN I NOT D/L A PATCH?  Only one of the above can be true, the other false.  Impulse and the website seem to think ... both of these are false.

Please help, because I believe that either someone is using valid keys out there in pirate databases ... OR ... your web service is failing in epic fashion.   Either one of these == fail in the long haul, especially in regards to my satisfaction as a customer who, up till this day, had been out there praising Stardock for their liberal policies re: noninvasive anti-piracy tactics.

Yes, I did and yet it still doesn't work! Gah, I can't even update the game or play online! This sucks.

I did use another email before, slate, but the problem is is that I can't remeber what it was or even the password to it.

OK, that may work for Mr. Wiggles.  But why is my SoaSE not listed under my ONLY email address ... yet galactic civ 1 is...?   I mean, if i already registered SoaSE, and that is the reason it's not working, it should show that i registered SoaSE in the same "see registered games" ... and i CAN access my account.