There's a very outdated topical index of the issues of the digest which is useful for finding references to specific bands in back issues. The ph7 mailing list concerns itself with the music and writings of Peter Hammill and related bands such as Van Der Graaf Generator. Recent discussions have included comments on Random Hold, Fripp, The Long Goodbye and Peter Hammill's two books of lyrics, poems, and short stories. A digested list that discusses Allan's music and session work. It deals with Marillion, Fish, and other related bands.
Archive server has lists of rare releases, huge FAQ, interviews etc.
Comments Now Web-based. The former Rush mailing list, The National Midnight Star, was discontinued. Comments Door X - the David Torn mailing list. Comments Related to Triumvirat, Juergen Fritz and Helmut Koellen. Note that this is a moderated site - you cannot just put files there.