In recent years, Jim was the technical lead for the Cyperpunks' Supercharger CD, a deluxe compilation of games and development tools for the Starpath Supercharger (a hardware add-on for the Atari 2600). He spent considerable time, right up through this past April, helping teach 6502 and 2600 programming to a new generation of programmers. People would bring him code snippets, asking if any improvements were possible, and Jim would whittle and optimize them in astounding ways; he was credited for doing just this for Oystron, a new hobbyist 2600 game released earlier this year.
In the last few months Jim unexpectedly gained wide exposure as the "leader" of the anti-spam movement. A recent interview with him on the subject is available.
In the words of Doug Ansell, who learned the ins and outs of Apple II programming from Jim when they worked together at Cavalier, "The industry has truly lost a legend. Time and time again he made the impossible possible." Jim Nitchals' web page is still online, and is well worth a heartfelt visit.