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Binjet
Search engine that works specifically with the provided application to download files posted to Usenet. Requires monthly subscription.
http://www.binjet.com/

Binobins
Newsgroups archives. Daily list of all movies posted to all newsgroups, weekly list of posted mp3 files.
http://www.binarchive.net/

Newsgroup Propagation Search Engine
Checks for availability of specific newsgroups at certain News Service Providers (NSPs).
http://groupsearch.aacity.net/

Newzsearch
Searchable archive of Usenet binary content, also provides nfo files.
http://www.newzsearch.com/

NNSeek
A web interface with a search engine for text only newsgroups. Doesn't support threaded view.
http://www.nnseek.com/

Usenet Address Database
Search for e-mail addresses if you know the name of a person, or the name of the organization that provides their net access. Returns the entries from addresses collected from Usenet postings between July 1991 and February 1996.
http://usenet-addresses.mit.edu/

Usenet Newsgroups Activity Statistics
Lists the most popular newsgroups based on articles read or posted, bytes posted, and most significant change in number of articles.
http://usenetstats.com/

Yarchive
Norman Yarvin's personal Usenet archive. He only archives articles he finds interesting, after having classified them by topic. These articles are also available for download as compressed files.
http://yarchive.net/