Recently I began writing an application for my toddler that uses compositions created with quartz composer. I am very impressed with Quartz composer, this is an application that I was unsure of it value in Tiger. QC makes it extremely easy to write and test 2d graphics, especially for kids educational software. QC still has a few short comings but it is progressing along nicely. One of the things I had to work around was QC’s inability to play a sound file. I recently completed writing a audio plugin renderer so that I can play a sound with my composition. One fascinating thing about Qc is that it is possible to write entire games in QC. I have run across asteroids and pong composed entirely in a QC composition.