Searches webpage for NNTP links and connects to each of them to find working ones. You can also search for a specific newsgroup. Very easy to use, pretty interface, lots of options, and produces an HTML webpage with the results. http://paing.sourceforge.net
Lists the most popular newsgroups based on articles read or posted, bytes posted, and most significant change in number of articles. http://usenetstats.com
Search Linux newsgroups in the alt.os.linux.* and comp.os.linux.* hierarchies. Daily news and applications releases tracking are also available. http://www.linuxbroker.com/news/newsgroups.html