All versions 1.1x and 1.9x are unstable beta releases - use them only for testing, and never distribute a program that is packed with them! There are known bugs.
The current stable release is 1.25, and the next stable release will be called version 2.00.
The main news in the unstable versions are support for bootable Linux kernels ("vmlinuz/386"), direct Linux ELF-to-memory decompression ("linux/elf386") and Playstation exes ("ps1/exe").

* UNSTABLE BETA VERSION - DO NOT USE EXCEPT FOR TESTING
* new format: added support for arm/pe (ARM executables running on WinCE)
* new format: added support for linux elf/amd64
* new format: added support for linux elf/ppc32
* new format: added support for mach/ppc32 (Apple Mac OS X)
* win32/pe: hopefully working "load config" support
* win32/pe: R6002 runtime errors worked around
* win32/pe: the stub now clears the dirty stack

[课程]Linux pwn 探索篇！