Briefly,
http://www.badastronomy.com was redirecting to the
Discover Magazine Bad Astronomy Blog.
At this moment,
http://www.badastronomy.com is the BA Blog contents that were moved to Discover. Right now both blogs have the same stuff -- except comments are turned on at Discover. I expect the old blog location to start redirecting soon to the new blog location.
And, for a while recently
http://www.badastronomy.com was not found, maybe due to server load.
I think one would be wise to update links to the BA Blog:
Discover Magazine Bad Astronomy Blog