UPDATED: Assimilate View Options v1.2
The script Assimilate View Options has been updated since one of its routines attempted to display the entire library playlist and this is no longer possible in iTunes 7.1. The script re-creates your playlists, excepting Smart Playlists and "special" playlists (Purchased, Podcasts, Party Shuffle, Audibooks, TV Shows, and Movies), then deletes the old ones so all of the View Options are the same as the main Music library (taking advantage of the fact that new playlists acquire the Music library's View Options).