I've had experience with three:
1) there's a "Baby Marino", that I never had, but the intern I was on SICU sub-i with had it. He read it during long stretches on rounds, and I read big Marino at night. He looked like a STUD quoting from that thing. I'm not sure what was in there, but what he said mimicked most of what I'd read in the bigger Marino.
2) During the aforementioned SICU rotation, I used a book I bought real cheap on the Ebay - Critical Care Clinical Companion, edited by Spector. The copy I have, sitting in front of me, has a green cover, and it copyrighted 2000. But it was great. Things are presented in bullet-form, so not tons of extra text, but real good when I was working thru a differential, needed a formula, or wanted a superquick info bolus with pimping-prone attendings. Will fit in the coat pocket but is also 800+ pages.
3) Tarascons lil' lilac book. I have it; nice and thin, super easy to carry. Tons of formulae, decent med reviews - including a "Groovy drugs" section (their title, not mine) that has MOA, SE, doses, etc for many of the ICU drugs. Doesn't have the volume or depth of books #1 or #2, but good in a pinch.
dc