WriteCD-RW for Mac

From Software Architects:

Write CD-RW! is everything you need to set up and run a CD Rewritable (CD-RW) drive and use it just like a high capacity floppy disk. Write CD-RW! is a powerfull utility that makes it easy to record data to CD-RW media. Write CD-RW! allows your CD-RW disc to appear just like any other drive on your desktop. In other words, your CD-RW drive handles files just like a hard disk or floppy disk.
This means you can drag & drop, rename, move or "delete" files using Finder, save files directly to the drive from your spreadsheet, word processor, or other applications, or download files directly from the internet. This makes using CD-RWs great for ongoing backup, archiving and general data for temporary storage and interchange.

For seamless, true drag and drop functionality, the file system and driver architectures need to be fully integrated. For over 14 years, SAI has been a pioneer and leader in developing file systems and driver utilities that support both block addressable media and sequential recording media. We applied this knowledge to create a utility that lets you save files and use CD-RW media just as you're used to with floppies.