It's quite easy to get access: fill out your email address on http://www.xsnews.com/ipv6/ipv6_aanvraag.php , and then wait a few minutes for the mail to arrive with all information.
The information will look like
Fill out that information in SABnzbd (www.sabnzbd.org) and start downloading! This works on Linux and Mac OS X with IPv6 enabled. If you haven't got IPv6 yet, use miredo.
It works automagically on Windows Vista and Windows 7 thanks to the built-in Teredo IPv6. On Windows XP you have to activate Teredo IPv6 yourself.
If you don't use SABnzbd but an other news downloader, you might need the IPv6 address of reader.ipv6.xsnews.nl, which is: 2a02:d28:5580:c::101:5