There was an incident when Windows Azure Management Portal does not list any hosted services even when I was sure that there are at least one hosted service. The problem look like as below:
If you see this problem this is maninly because Silvelight cache issue. To solve it please change your portal language to something else and then change back to "English" this will clear the cache and shows hosted service list.
I hit the same error yesterday, you saved me some grief. Thank you.