Historical Usenet archives and statistics make interesting grounds for virtual exploration.
Google maintains the most complete Usenet
archive with postings available from the present back to the early 1980's.
This invaluable collection contains an historically fascinating set of archives,
including early newsgroups in the "net" and "fa" (from ARPANET)
hierarchies, such as the famous human-nets and sf-lovers lists.
Some particularly memorable postings of early "firsts" are collected here.
The UUNET
Archive also maintains an historical Usenet archive with postings from the "comp" and "rec" hierarchies from 1996.
Statistics. The following sites maintain historical Usenet traffic statistics:
Current
Usenet traffic statistics can be found here.
Historical index.
An archived index to old newsgroup archives stored on the Internet around
the world can be found at Cameron Laird's page below, interesting mainly for
historical
purposes.
Many links are broken or inaccessible, and even if you can access them some
archives
are stored
in a binary form which need to be decompressed before they can be read.