Around the year 2000, I made few Atari 2600 games for Ebivision.
More recently, I hacked some classic titles just for fun.
Allia Quest - Atari 2600
Allia Quest
Homebrews
Everytime I made a game, I tried to achieve something not already seen on the Atari 2600 : two field of stars in parallax scrolling (Allia Quest), 3D algorithm (Merlin's Walls), Text-scrolling (Power Off!)...
I hope that you'll enjoy them !
Atari 2600 - Hack
Go Get Fat

Hacks
My first hacks have been easily made, thanks to Bithacker. To go further, I sometime change the 6502 code by disassembling it (with Distella), editing it (with Notepad !) and assembling it again (with Dasm)
Here are some 2600 hacks ;)