D52 version 3.1 has finally been released. You may access it on the left side of the 8052.com web page. (Earlier versions of the disassembler were called D51.)

Version 3.1 contains many bug fixes and some new enhancements--the ability to specify header and inline comments, names for operands at specific locations, and other goodies. In addition to the 8052 disassembler, the zip file also contains disassemblers for 8048 and Z80 microcontrollers. Executable programs for Windows/DOS and Linux are included, and of course, the complete C source files (GNU GPL).

Enjoy.