Internet Resources:
World-Wide-WebUSENET NewsgroupsIRC

World-Wide-Web
The C64 Web-RingThe centre page for the Commodore Web-Ring, which contains heaps of other Commodore 8-Bit related sites.
C64 SID searchThis site is a search engine of SIDtunes, (i.e. C64 music) to run on SIDplay. Although not as simple to use as other search engines, this one is very powerful, and useful if you're looking for a tune to listen to!
Commodore FTP searchA nifty search ngine, used fo locate files of any type (demos, documents, games etc..), which searchs over a vast range of C64 FTP sites. Useful, if you're looking for a specific title
C64 SearchIf you're stuck looking for a certain game, try this! Indexing around 10 of the major C64 game archives, a search with this should yield you a quick result!
The C64 Games DatabaseLike C64-Search, the C64GD also catagorises a huge number of games sites (including the High Voltage CD collection) for it's queries.

USENET NewsGroups
comp.emulators.cbm NewsgroupThis newsgroup is one of the best places to ask for help if you're just getting started with using C64 emulators, and there's a comprehensive list of sites which is frequently posted, which might help with finding rare games.
comp.sys.cbm NewsgroupThis newsgroup deals with similar topic as with comp.emulators.cbm, but emulation discussion is not something that is seriously welcome here.
comp.binaries.cbm NewsgroupOnly used for releasing freeware/public domain software, you can find some useful programs here!
Internet Relay Chat: The Channels #C-64 on IRCNET and #gamebase on EFNET are the only ones that I'm aware of at the moment.