The VICE Emulator
A very good Commodore emulator that runs under Unix, MS-DOS, Win32, OS/2, Acorn RISC OS or BeOS. Besides the C-64 it also emulates the C128, the VIC20, all the PET models (except the SuperPET 9000, which is out of line anyway), the PLUS4 and the CBM-II (aka C610)!
CCS64 - A Commodore 64 Emulator
A good C-64 emulator that since version 3 runs in windowed mode and also offers multiplay over Internet.
Offers demos and games with lots of screenshots. Live interviews as MP3's with people like Rob Hubbard, David Whittaker, Ben Daglish and more. Interviews with old sceners, articles about old software companies and much, much more!
COCOS - Commodore Computer Sitelist
Great C-64 webdirectory with links to almost every c64 related site. Portal
A nice site including all the latest about the C-64; News, Parties, Releases...
Star Commander Homepage
Do you want to transfer your collection of disks to your PC or transfer C-64 stuff downloaded from the net to your belowed C-64? This site has the program for it and also schematics on how to build different types of cables needed.
Nice site for nostalgic people.
CSDb - The C-64 Scene Database
Huge database including lots of information and releases from almost every group and scener ever existing.
The High Voltage SID Collection.
A collection of more or less all SIDs ever composed on this wonderful machine. Over 25000 tunes included in writing moment!
C64.ORG - The C-64 Portal
Great site by Slaygon with links and news.
The Demo Dungeon
A collection of the best demos from different groups, based on the maintainer Steppe's taste :)
Doc Snyder's Page
A great page with lots of old crackintros re-coded for your browser!
Big C-64 resource - mainly C-64 game oriented. Lots of games, big forum, nice features.
A C-64 scene related portal - lots of demos, fresh news, nice design.