Spec maps... i never could get those to look right, and even then i dont like how the shine maps look on my system... its like they make the whole model look like its glowing or something, even with low ambient light there still look like light bulbs...so i just turned them off. granted they dont shine, but the lighting effect is better, models actually have a lighted side, and a dark side. maybe i just have to tinker with the launcher settings?
and normal maps...i'm still not really clear on how those work or what exactly they do. heck, trying to make see through glass seems kind daunting still. i'll get there one day though.