okay, just to throw my 2 cents into the ring, since this site was incredibly helpful in my study prep.
i took step 2 CK recently. i'm coming from a year off after my third year of med school, and since i'm applying for residency in a competitive field, i knew i had to do well. i studied for 5 weeks hard core and think the following were the most helpful resources in order of importance:
1. USMLEWorld
2. USMLEWorld
3. USMLEWorld
4. NBME Practice Tests (very indicative of the real thing; I identified specific diseases I didn't know on the NBME exams, went back and studied them, and these diseases showed up multiple times on Step 2)
4. Boards and Wards
5. Secrets
I also used for specific subject matter:
-Medicine - Pocket Medicine, as well as the Washington Manual (both pocketbooks present things concisely and based on EBM) . . . great for "next step" and best treatment types of questions . . . I didn't read from these books directly but whenever questions came up on UW that I didn't have a good concept of, I would go back and read what the entry was in one of these pocketbooks
I also recommend FA Step 1 Pathology/Physiology because you need to have a good basis of the basic science for Step 2 (15% of Step 2 is basic science)
-Surgery-Kaplan Lecture notes; excellent resource with as much coverage of trauma you'll need to know for Step 2
-Neuro-couldn't find good resources; reviewed a few stuff from FA Step 1 (yes, Step 1); reviewed a couple of sections in HY Neuroanatomy
-OB/GYN-High Yield OB (definitely distills OB/GYN into a very concise format) but may not be enough for a few of the picky questions on Step 2 (if there's any concern, and you have time, look at Blueprints)
-Psych-again, no good resources to recommend but most of the stuff on Step 2 was fairly straightforward
-Peds-skimmed Blueprints Peds
I cannot stress how helpful UW was. I began doing 46q untimed random mode and would get 30s-40s%. no joke! don't worry if this happens to you. just keep at it. try to learn the concepts, and not necessarily memorize the minutiae (except for preventive medicine; the real Step 2 expects you to know minutiae). the questions on UW will seem easier and somewhat repetitive over time. By the end, most of the time I was hitting mid 70s to low 80s, with the occasional high 50s/low 60s.
I decided to do my studying in blocks by subject (i.e, Cards, Rheum, Pulm, OB, GYN, Neuro, Psych, etc) and after doing my reading from review texts for each block (using the resources listed above), I would do 1-2 blocks of UW questions that corresponded to that subject (i.e, Cards) for reinforcement. Then I'd do a block of random questions to keep up with subjects I'd already studied and to anticipate the types of questions I'd need to study for the subjects left.
I thought UW, B/W, and Secrets were great but not enough to rock Step 2 without some extra studying (again, I was coming from a year off and had forgetten everything). The true helpfulness of these resources is that if there was some disease I wasn't sure about or felt like I didn't know well, I knew I could look it up in other resources.
NBME 2 taken 1.5 weeks before the real thing = 259
NBME 3 taken 2 days before the real thing = 261
Step 2 = 260/99
(Step 1 = 254)
Just to give reassurance to anyone who is taking Step 2 after a long break from clinical rotations, don't fret! I don't think one has to take Step 2 while "everything is fresh." Just give yourself a little extra time, and if you paid attention during 3rd year, most of the stuff will come back.
I got a 208 on step 1.
made less than 100% certain. 
