BurnAgain FS lets you change the content of your data CD or DVD simply using the Finder. With BurnAgain FS you can re-mount your disk like a harddisk volume and add files, remove files, even edit and change files several times. When finished, simply click "close" to burn your changes to the media.
You can do this with CDR, CDRW, DVD+RW and DVD-RW, without erasing, until the disk is full.
Version 1.0 of BurnAgain FS has just been released and is available for download.