Yes there is. You should each create a personal Playlist. Open iTunes and go to File/New Playlist. Name your Playlist, then drag and drop the music you want to hear to it. You can have the same track on multiple playlists. When you sync your ipod|(s) click your ipod under devices in the left column of iTunes, then go along the menu to Music.
Click the button by selected playlists, then choose the playlist(s) you want to sync to.