To get contact with other fans:
There is now the One-Word Mailing List, devoted to
the discussion of John McLaughlin and beyond. There is also mailing-list archive.
There is also a
Miles Davis LISTSERV, where they discuss varies of topics, including
sidemen of Miles (i.e. also John McLaughlin).
And, of course, there is a newsgroup called rec.music.bluenote.
The John McLaughlin Internet Fan Club.