Google's support page has more
http://support.google.com/blogger/bin/answer.py?hl=en&answer=2402711
Why does my blog redirect to a country-specific URL?
Q: Why am I seeing a URL change?
A: Over the coming weeks you might notice that the URL of a blog you're reading has been redirected to a country-code top level domain, or "ccTLD." For example, if you're in Australia and viewing [blogname].blogspot.com, you might be redirected [blogname].blogspot.com.au. A ccTLD, when it appears, corresponds with the country of the reader’s current location. {From Support Page}
Also that Google will censor blogger's blog as per the country like twitter following country censorship policy.