I hate to disagree here, Quinn, but the new revised Sepsis guidelines are "hot off the presses." So, there are some things that have changed for 2008, such as no more routine Cortisol Stim tests, limited use for steroids, no role for Xygris, etc.
As for what to read, Marino is a good start for the basic physio, but keep in mind he interjects his own opinion quite often, and it isn't necessarily always the "right way" to do things...
I would get my hands on a pocket critical care/internal medicine pocket guide. I would also use
www.ccmtutorials.com I would also use pacep.org for Swan gantz catheters (a really great website!!!) Don't forget to search for ventilators on Up-to-Date.
Beyond that, the point of your rotation is to LEARN. You will learn more in your ICU month than you will on any other month (including EM months). Keep reading all the articles they suggest.
Have an extremely low threshold for calling your senior/attending. Don't wait until the patient goes down the tubes before calling. I would prefer to be bothered early and often, rather than when the patient is coding...
And, for the love of god, please don't try any procedures without an attending/senior resident there until you are comfortable doing them by yourself... Hope that helps!!