I hope you will try Giganews or UsenetServer for your news subscription -- especially as a holiday present for your friends, family, or yourself!
Spam tools: (server based)
BOURSY By Usenet Cabal. Batch Oriented Usenet Retroactive Spam Yanker lets you run Highwind-style filters on INN and Collabra. Uses a newsfeed, requires no patches or embedded perl. For traditional-style spools (INN 1.x) only.
Newsbot "is a set of scripts and programs weeding the lists of "open newsservers" found on the 'net and validating them. If a open server is found, a mail is sent out to its admin, telling him which consequences running a open sever could result into and helping him to close his server agains misuse. Next, the server is added to the list of open servers and availiable to admins and de-spammers for insertion into their watch- and pathexclude-lists."