Recently, I came across nice application called Floola. From the project home page:
Floola is a freeware application to efficiently manage your iPod or your Motorola mobile phone (any model supporting iTunes). It's a standalone application that can be run directly from your iPod and needs no installation under Linux, Mac OS X and Windows (Windows Vista is supported).
Floola supports all common used iPod features including artwork, podcasts and smart playlists! It's also able to convert audio or video incompatible with the iPod so that you can copy almost any file to it. It even allows adding youtube and myspace videos just entering the page url!
In other words it is cross-platform application that makes it easy to copy music and videos to and from your iPod from and to any computer.
=> Floola project home page [ 4.9Mb Linux version ]