Lots of cysters have had great success on glucaphage and getting pregnant and having a period on a regular basis. All bodies are different so it is hard to say if it will work for you. From my experience I was one month away from going on clomid and only taking 1500mg of glucaphageXR when I got pregnant. I had normal cycles for three months straight which for me was a huge improvement.
For your IR questions: No it does not mean that you have diabetes (you are at a higher risk of developing it). IR is when your pancreas produces massive amounts of insulin because your body doesn't use insulin properly. You will have a better success of controlling it with the glucaphage but your rate will be even higher w/ a low carb diabetic diet and excersize plus it may increase your chance of getting pregnant on the low carb diet as well.
I did the diet, walked 2+ miles a day and lost 50+lbs in over a period of a year. Then, I was able to get pregnant.
Sorry of such a long reply

Hope this answers your questions.
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Lori
Dx 07/01
Type II Diabetes 10/00
IR 09/01
Insulin 3x's daily
Pre Natal vitamins
EDD 09-27-02
lorimckenzie@earthlink.net