Usenet
The normal port for newsservers 119 is usually blocked, so you have to access the Usenet via a different port. If you only sometimes want to read some very common newsgroups you can easily visit them via free web-based newsservers like http://groups.google.com/, http://news.spaceports.com/, http://wnews.easyusenet.com/wnews-free.cgi and http://www.news2web.com/. A lot of newsserver companies offer their services on a non standard port. Just ask them before signup. If you need access to a newsserver with your newsclient you have to subscribe to one of these newsserver-companies which allow access to their newsservers on an uncommon port:
http://www.giganews.com/ - (news.giganews.com on ports 23 and 80)
http://www.teranews.com/ - (news.teranews.com on ports 23, 25 and 7501)
http://www.easynews.com/ - (proxy.news.easynews.com on 22, 23, 53, 80, 110 and 443, or try their web-based service at members.easynews.com port 81)
http://www.newscene.com/ - (proxy.newscene.com on ports 20, 21, 22, 23, 25, 53, 80, 81, 110, 443 and 8080)
http://www.supernews.com/ - (news.supernews.com on any port you like)
http://www.octanews.com/ - (news.octanews.com on any port you like)
http://www.readfreenews.com/ - (news.readfreenews.net and allnews.readfreenews.net at port 80 and 120
Note: all traffic is unencrypted, so you can access these newsservers, but the censors can easily monitor all your traffic! It would be more secure to use a SSH port forwarding.
More info: http://www.encyclopedia-online.info/Usenet