To make it easier with the all at once burn method I create a burn folder. Right clicking on the folders properties helps me know when I have enough to fill a CD-r. You can then just drag the entire contents into your burn software rather then having to sort through various folders, files, and file locations prior to burning a whole disk.

I don't use RW's because of:

-Price - more the CD-r discs
-Time - Takes time to format when you want to clean on of and re-use.
-Have heard of others loosing data of of RW's more often then CD-r discs.
-And last of all when I am done with a CD-r it makes nice in expensive coaster and/or yard ornament to scare birds away from my garden.

Ok I admit it the last one was meant to be a little silly.