Aspire,
Here is the deal. Whatever strategy you are looking for, will work for you only if you get the gyst of the passage at the end. Remember, for every specific detail question that GMAT asks you, you have a liberty to go back to the passage and look for an answer.
I will share with you what I usually do. I do not use any strategies to skim thru the passage. I usually take at the most 2 mins. to go thru the passage but in these two mins I try to read carefully and not to skip anything. Then for each specific questions, I go back to the passage and locate the relevent info till I converge on an answer. WHen you read the passage carefully for the first time, I think eventually you spend less time.
Initially, I used to think that I will spend a lot of time doing this. But, believe it or not, it does not take that long. You spend 2 mins to read the passage and about a min. and half for each specific detail question. The most important thing on RC is to time yourself and see what works best for you whether it is skimming thru the passage or reading carefully the first time. I usually get 70% correct, the only incorrect I usually get are general questions, mostly INFERENCE questions. But, I am in the early stages of my prep and I am sure as I practice more, this definately will improve.
Hope this helps
-buds