the biggest problem with Lightscribe for a Mac is it is easy to find the simple labeler but not the full template version I did the work here for you, this is the link to the proper labeler to fully use Lightscribe:
http://www.lacie.com/support/drivers/driver.htm?id=10061
edit:
OK the info gets even better now the normal settings for the lightscribe labeler are a little washed out even in the highest contrast setting BUT here's the good news you can fix that by opening a terminal window and upping the print quality if you follow the instructions here:
http://www.lightscribe.com/downloadSection/pse/
Just scroll down to the instructions for Mac and click on the little link marked "here" in the paragraph to figure out how--it will cause the burner to take a bit longer to burn a high contrast label but well worth the time.