Mt. Rainer is a standard that allows simplification and compatibility for OS's and allows CD-r's to replace floppy's...
Drag and drop functionality, auto CDRW reformat (That tripped me up once because one time I put in a blank CDRW and it said no media so it took me a while to figure that out) auto multisession, all through windows explorer drag and drop, and the ability to create bootable floppies... *nice*...