Dustlayer - The Commodore C64 page for Beginners to 6502 Programming.
CBM .prg Studio - A Windows IDE which allows you to type a BASIC or machine code program and convert it to a '.prg' file, which you can then run in an emulator or on real hardware. It also includes character, sprite and screen editors and a fully featured 6510/65816 debugger.
Compute!'s Gazette Online - A complete run of all 84 issues! Download or browse the magazines online.
64 Bites - Learn BASIC and 6502 Assembly with bite-sized video tutorials.
The Future was 8 Bit - Dedicated to keeping 8-bit machines (especially Commodores) running via new hardware and repairs.
C64 Brain - Learn about Commodore 64 game design, and read old magazines.