We moved some Weblogs.Com sites to another server tonight to help spread out the load. For the moved sites a DNS change was required -- so if you're having trouble getting to a particular Weblogs.Com site, it may be that the DNS change is still propagating. It may take a few hours.
Radio UserLand and Firewalls -- a change was made in what happens when you click the Radio UserLand button to edit an object in a Manila site. It should now work for people behind firewalls.