Yelsha's Universe does not include even a millionth of what can be found on the Internet, not even a millionth of things Yelsha is interested in on the 'Net. So listed below are some of the ways to find more about the things that interest you. These aren't the only ones but they're the ones Yelsha, et al, use and have found to be effective. Good luck with your web hunt.
I know there are more out there, but eGroups and ONElist were combined and bought out and they were the two largest servers. For these look at Yahoo!Groups.
For more information on "webrings," check out: http://www.webringinfo.com/
Sure there are the classic Hotmail and Yahoo! but there are some interesting servers out there that have just as good of service.
For a listing of over 1000 email providers, check out: http://www.emailaddresses.com/