I used the extended weekend for some Cocoa hacking and came up with the
following prototype:
http://homepage.mac.com/neeracher/LilypondApp_30May05.tgz
This is an application that combines the functionality of Lilypond.app,
ClickEdit.app, and Preview.app in one application. By default, it will
just run lilypond out of your fink installation, but it can also be run
as a fully bundled standalone if you copy {bin,etc,lib,share} from the
official Lilypond.app into this app and drop in the following slightly
modified script into Contents/Resources :