ok, so this is what i understand:
My Book (about 25% more expensive):
Caviar Black drive (most likely) - ie faster
No backup software
My Book Essential
Caviar Green drive - ie slower
encrypts the data so if you take the drive out a connect it on a motherboard you can't get your data (according to one post) - not sure if this is before or after installing the backup software.
So my question is given that the My Book seems the better purchase, why do WD not advertise it on their site? And why do the main techie shops where i buy stuff here in the UK not have the My Book drive, but do have the Essentials? Is the My Book end of life or something? Got a problem with it?