Petscii Forums
- Discussion boards for TelBBS, Quantum Link Reloaded, DTVHacking, Retrobits podcast and programming.
- http://jledger.proboards19.com/

Yahoo! Groups : c64
- A mailing list for any and all Commodore 64 related discussion.
- http://groups.yahoo.com/group/c64/

Yahoo! Groups : classiccommodore
- Open to all who wish to preserve the knowledge of classic Commodore VIC20/C64/128 line of computers.
- http://groups.yahoo.com/group/classiccommodore/

Secret Society of Commodore Coders
- Message board for discussing BASIC 2.0, BASIC extensions, and ML on the stock C64.
- http://ssocc.proboards45.com/

Commodore 64 Forums
- Commodore 64 message board with forums for hardware, software and emulators.
- http://commodore-forums.wabbit-wion.nl

Lemon's C= Forum
- Emphasizes games but also has forums for general C64 news, new releases, tech support, the demoscene, and a marketplace for buying/selling/trading.
- http://www.lemon64.com/forum/

cbm-hackers
- Searchable archives of a mailing list devoted to programming the Commodore line of 8-bit computers.
- http://www.softwolves.pp.se/misc/arkiv/