It is strongly suggested that you read Adding Xandros Repositories before blindly following the instructions here. The article includes instructions for safely adding debian etch repositories, though you do this at your own risk. Your system will be rendered unsupportable
“The official word from Xandros is that adding Debian repositories will break Xandros.”
The above referenced wiki article goes into considerable detail about pinning repositories which is not considered here.
As Xandros is based upon the debian kernel a lot of additional software packages can be downloaded from the debian feeds. Adding the debian feeds is simple:
An example of the Debian repo entry in /etc/apt/sources.list for NL mirror is:
deb ftp://ftp.nl.debian.org/debian etch main contrib non-free
Note: kde libraries and kernel dependent modules from Debian etch repos do not work for your EeePC. Therefore, NEVER RUN “apt-get upgrade” or you may break your system. The article at Adding Xandros Repositories has instructions about pinning to make this much safer.
You can use another release (e.g. lenny, if you want newer packages), not just “etch”, however, etch seems to be most compatible. Using lenny will almost certainly upgrade your libc, thus forcing you to update many packages, which will absolutely break things.