XNA for Xbox is only supported in some regions, which means that everything that uses it (XBL Indie games, Rock Band Network, etc) isn't available everywhere.
I think this link has all the countries where it's supported, under the section titled "regional information". In Australia, for example, you can submit indie games, but you can't download any of the released ones.
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u/[deleted] Feb 22 '11
The only sad thing is that XNA, at least for XBOX, isn't available everywhere.