If you're from the UK, you will be familiar with the ICS already, but if not...
The Intensive Care Society is the representative body in the UK for intensive care professionals and patients and is dedicated to the delivery of the highest quality of critical care to patients.
They perform many functions for the intensive care community, such as the production of guidelines and standards, organising national meetings, training courses and focus groups.
They represent Intensive Care in wide ranging organisations from the Royal Colleges to the Department of Health and other organisations and societies with an associated stake or interest. They are also represented on the Intercollegiate Board for Training in Intensive Care Medicine.
Check out their website, where they have lots of useful and interesting resources. It's always interesting to see guidelines that others have spent many hours making, such as these ones on an approach to Adult Organ and Tissue Donation in the UK.