This article is from the Amiga FAQ, by Ignaz Kellerer with numerous contributions by others.
The current amiga-gcc-port maintainer is available:
Philippe BRAND Fidonet: Ramses The Amiga Flying BBS 2:320/104.21 Email: email@example.com (ONLY for personnal email). Ftp: ftp://colombo.telesys-innov.fr/pub/ or /pub/incoming/uploads for uploads.
There's also an amiga-gcc mailing list running in Finland. See Mailing lists. Philippe Brand will forward all questions to that list, but you'd be better off using it directly ;)