Installing Encyclopodia from Linux or Mac is still a bit inconvenient, because there isn't any easy-to-use setup wizard (yet), as there already is for Windows. If you think this sucks, please feel free to write a setup-wizard for Linux or Mac on your own ;-)
To install Encyclopodia from Linux or Mac, follow these steps:
If you're using Windows, you may not be able to access the ext3-partition that was just created on your iPod. To do this, get an ext2/3-Driver for Windows, eg. this one.
Download the Encyclopodia base system, delete the data on the ext3-Partition of your iPod and unpack the base-system on the (now empty) ext3-partition of your iPod.
Open the "data"-folder of the FAT32-partition on your iPod (if you have a Mac-formatted iPod, you have to create a "data" directory as subdirectory of the "mnt"-folder of your iPod). Create a subdirectory called "encyclopodia" and unpack your language pack there. Your iPod's FAT32-partition should now have the following directory structure:
iPod_Control (hidden directory)
library (empty directory)
Download some electronic books – such as the Wikipedia in your language – from the ebook library and place them in the directory "data --> encyclopodia --> library" on your iPod. Eject your iPod now.
If you have a 1st, 2nd or 3rd generation iPod, hold down the menu and the play button for 5 seconds. If you have a fourth generation iPod or an iPod mini, hold down the menu and the select button for 5 seconds. This will cause the iPod to reboot.
When the iPod boots, you can choose whether to boot in normal mode (for playing music) or in encyclopodia mode by holding the "rewind" key.