NNTPCache is Squid for news (plus lots more). NNTPCache (very efficiently, using shared memory, COW, mmaps, etc) executes on the localhost pretending to be an NNRP news reading server. In fact, what it does is pass certain NNTP commands through to real (remote and possibly local) news-servers based on various pattern matching rules. nntpcache then takes the output from those servers and caches & indexes it in funky ways (much specific case magic goes into this). The next time such information is asked for, or other information which can be logically inferred from the previously collated information, it is sent directly from the cache, without consulting the remote servers. NNTPCache can transparently merge multiple servers, (permiting local newsgroups with remote NNTP feeds), filter articles, xovers, and headers based on weighted regular expressions, and has built in NoCem/PGP (anti-spam) support (see http://www.nocem.org/ for details).