Thanx much for you note. I looked at this article and noticed the keyword categories are indeed included in version 3. When I tested Beta 1 and Beta 2 it seemed to me that they have changed the keywords panel as compared with Lightroom 2. I was not able to add keywords categories in Beta 1 but in Beta 2 I was somewhat able to do it even though it didn’t seem very easy. So…thanx for your note.

Are you sure about that as many tutorials on the net seem to indicate you can in Lightroom 3. Example: http://lightroomsecrets.com/2010/11/where-do-my-keywords-live/