There have been some rather useful 'five line' transcriptions of the dialogue chants which may be good for introducing choirs and congregations to these chants. Copies could be made and included in orders of service and possibly pasted in the front of choir folders. There was James' MacMillan's Tu es Petrus at Westminster but Er... erhm... that's it. More on the MacMillan later when I get hold of a score. Some reactions from Laodicea can be found here. Fr Blake provides a link to a video and sound file here.