4 links
cbm-hackers
softwolves.pp.se
Searchable archives of a mailing list devoted to programming the Commodore line of 8-bit computers.
Lemon's C= Forum
lemon64.com
Emphasizes games but also has forums for general C64 news, new releases, tech support, the demoscene, and a marketplace for buying/selling/trading.
Yahoo! Groups : c64
groups.yahoo.com
A mailing list for any and all Commodore 64 related discussion.
Yahoo! Groups : classiccommodore
groups.yahoo.com
Open to all who wish to preserve the knowledge of classic Commodore VIC20/C64/128 line of computers.