Sidux 2009-1 concentrates on integrating the changes caused by kernel 2.6.28, stabilising the init optimisations accomplished by insserv, and in particular improving the reliability of the installer and the USB installers. Kernel 2.6.28 doesn't only improve and stabilise hardware support for newer devices, it also adapts the I/O scheduler support for SSDs in order to improve prioritisation of disk access and to speed these up. Another major accomplishment is the deployment of the open-source OpenFWWF firmware for Broadcom wireless devices.

The sidux distribution is a desktop-oriented operating system and live CD based on the unstable branch of Debian GNU/Linux. Besides full compatibility with its parent, the distribution also offers a custom kernel with support for a wide variety of modern hardware devices, KDE as the default desktop environment, a rolling release cycle, and compliance with Debian's Free Software guidelines.