Basically I burn a lot of audio to CDs and for some reason, these wont disappear from my sidebar and I don't know why. Even though the CDs have been ejected.
Right click on one of the cds in the sidebar and select "remove from sidebar" and see if that does the trick. If that doesn't work, a reboot should remove them.
Strange, when I right click on one of the things in my side bar in finder a little menu pops up... remove from menu is listed just above sidebar preferences.