Different values and units are added to CSS properties at different times, the current batch module for CSS is 3. To be honest I haven’t kept up with it all as much as I should have. These are the best tutorials I could fine on CSS3, I hope they are helpful to someone.
20 Very Useful CSS3 Tutorials
3.CSS3 Transparency: The Opacity Property (from manadarindesign.com)
5.CSS3 Opacity (from exforsys.com)
7.CSS3 Color Names (this is certainly worth a bookmark).
Thanks to everyone who emailed me some of these links.