Yes. Off the top of my head, mithral medium armor is treated as light armor (no speed reduction), and the Knight (PHB2) has a pair of class features that remove the movement penalties associated with wearing medium/heavy armour.
Frankly, I think the designers and novelists did great work in the post-Spellplague Realms. But, in the end, this wasn’t a new setting. It was the Realms, the Realms 100 years later, and therein lay the problem.