As long as my library was small enough to fit on a 30GB iPod, it made sense to me to keep the full library on the iPod.
Once the library grew past that point and I had to limit the items to sync I realized that with a set of smart playlists I could probably get by with 8GB and have 99% of everything I'd normally want to listen to on the go synced. 16GB would add room for a couple movies/TV-series too.
Everything is completely and to my knowledge correctly tagged, so navigating, finding stuff etc. vs junk isn't really an issue for me.
Once the library grew past that point and I had to limit the items to sync I realized that with a set of smart playlists I could probably get by with 8GB and have 99% of everything I'd normally want to listen to on the go synced. 16GB would add room for a couple movies/TV-series too.
Everything is completely and to my knowledge correctly tagged, so navigating, finding stuff etc. vs junk isn't really an issue for me.