In Ubuntu 12.10 the default behavior when inserting a CD (or a USB memory stick, etc.) is to add a list of mounted devices to the launcher. This takes up a lot of extra space for me as I usually have several Samba mounts. Furthermore, I don't need or want to see my CD in the launcher.
I can click right on the mounted devices and select "Unlock from launcher", but the next time I insert a CD they're back. Disabling this "feature" should be an option in 12.10. I believe it was an option in 12.04 via CCSM. Thanks.