I face the same challenges with hyperpigmentation. I decided to do a google search just to see what information is out there and I found a really helpful article:

Acne Scars - Post Inflammatory Hyperpigmentation Acne Scars

The great thing is that they will fade. The not so great thing is that, according to the article, it may take between 3 and 24 months.

I've definitely heard of using glycolic acid, and the article gives a list of some other great over-the-counter ingredients to look for.
Starting CG method *again* at the beginning of March 2012.

2b, low density, normal porosity

~ Sulfate & Silicone free for over 3 years ~