UPX 2.01 has been released. Please report all problems and bugs in our bug tracker.

The main news in version 2 are:

    * 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)
    * new format: added support for bootable Linux kernels ("vmlinuz/386")
    * new format: added support for Playstation exes ("ps1/exe")
    * slightly better compression using the new NRV2E algorithm
    * new options for compression tuning (e.g. '--brute')
    * improved win32/pe compatibility
    * direct ELF-to-memory decompression
    * various bug fixes

http://upx.sourceforge.net/

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