The latest issue of Care of the Critically Ill (December 2008 - but only just out!) has a useful review of sedation and delirium assessment in the ICU. As you would expect it explains why brain monitoring is so important in our patients and outlines the sedation and delirium screening tools available. This journal is targeted at the multi-disciplinary critical care team and written with that in mind.
Beg, steal or better borrow a copy.

Care of the Critically Ill. December 2008 Volume 24.6