With iOS4 it is possible to make new, named custom playlists directly on the phone.
This works fine for me, expect when I connect the iPhone to any machine (mac or pc) that has iTunes running (even if it's not the paired iTunes for the iPhone.) all the customisations that I've made to playlists, new ones or re-ordered existing ones, are destroyed.
Google can't seem to find results for me due to too much noise about iPhones and Playlists.
Does this happen to everyone or just me. It seems like the edits should sync back. BTW I don't have syncing setup on the iphone, and all music is set to be managed manually.