Well it seems. I've just mailed a publisher to please upload their open-source release to Aminet, and "accidentally" used
www.aminet.net as the reference address.
But ... I'm fairly sure this address *DID* work some months ago. Probably someone equipped with a decent lot of smattering of networks has been experimenting with the DNS and fucked up some setting(s) again? Not that I wasn't encountering this for the first time, at least not with other sites...
http://aminet.net works, also
http://de.aminet.net, but not
http://us.aminet.net.