I'm copying a post of ZDevil here. I think the topic deserves a thread of its own!
Actually installing Debian can be as easy as installing Cacko, pdaXrom (non-uboot versions) and Angstrom.
There is an alternative way to install it without using networking.
*** The "10-step-self-help guide to enjoying a popular penguin" ***
Just start from here: http://www.bigbridgezau.sakura.ne.jp/dev/debian/
#1 Download 4 things and copy them to the root of SD:
zImage-2.6.17-cpufreq-fastfpe.bin OR zImage-2.6.20-cpufreq.bin (This is the kernel; rename it to zImange.bin)
hddrootfs.tar.gz (This is the base system and Etch; rename it to hdimage1.tgz)
#2 Reboot the Z while pressing [OK] to enter the flash menu
#3 Just flash as usual by choosing "4" and then "SD" and then "Y"
#4 If things go well (they should), then kernel will flash and the big tarball will decompress to /dev/hda1. This may take an hour.
#5 Installation will complete itself and reboot the machine. Debian is ready to go!
#6 You can then do the postinstallation steps as descibed in "After installation" in the titchy linux wiki: http://wiki.neilandtheresa.co.uk/Titchy_Linux/Installing
#7 To upgrade from Etch ("stable" but a bit dated) and Lenny ("testing" and the new stuff), change "etch" to "lenny" in /etc/apt/sources.list
#8 apt-get update
#9 apt-get dist-upgrade
Plus two desserts:
#11 If you fancy playing with over/underclocking, grab the dvfm binary (not the armel.zip) from the japanese link above.
#12 If you feel like trying different (Angstrom) kernels, three versions are available: 2.6.17-fastfpe-cpufreq, 2.6.20-cpufreq, 2.6.22-cpufreq.
Remember to use the same updater.sh from the download location of the kernel!
More discussion this way: http://www.oesf.org/forum/index.php?showtopic=24815.
And be CAREFUL: do NOT flash the kernel with the big installation tarball, because your disk may get reformatted and wiped clean and overwritten with a clean install!
End of quote!
Be cautious and make lists of your network files and sources.list. I didn't and it has been a little inconvenient! Well done ZDevil!