C64DX related Links

Toxic Waste's C65 Site Nice Pictures and some Documentation
funet/pub/cbm/c65 The european CBM-Server
Secret Weapons of Commodore: The Commodore 65 From Cameron Kaiser
The Machine Room: Commodore 65 The Machine-Room has almost every ever produced 8-Bit Computer
Heimcomputer.de: Commodore C65 Prototyp A german Site
CCOM Commodore Computer Online Museum Another German Site
For transferring Data to/from the Disks X1541-interfacesvia cable
copy1581 uses MS-DOS to read 3.5" Disks
Linux has (rudimentary) built-in support for reading CBM 3.5" Diskformat

Commodore related Links

Plus/4 IO-Map with pinouts
Flash Attack! a multi-player PET Game
LunixNET this 6-Computer Network comes with its own OS
CUtils a parallel Connection between VIC-20 and PC
C64 Open News Good Portal with fresh News from the PAL-Scene
Commodore Wire Magazine with Up-to-date Information

PC related Links

MESS Multi Emulator Super System, with a C65 Emulator
PC-Tools maintained by Bacchus/FLT

Various Computer related Links

The Hardware Book Contains all you need to solder
GameBoy Dev'rs Turn your GameBoy from a handheld-console into a portable Computer

Commercial Links

Search ebay for C65 In case you don't own a C65 already