Leonardo Vilela Pinheiro wrote:
They have indexed some of the usenet and one is able to subscribe to a group (or usenet "channel") and choose to receive messages by email or just read it on google group's website like a forum (and write/follow-up from there).
There is one interesting feature, though. One can make a "group" and tell Google to index an already existing mailing list, then Google gives you an email (like group-98123@googlegroup.com
gmane.org - been doing this for years.