I've got a copy with a review pending (it'll be written in a day or two). Good product.
Has a number of PrCs focused on a particular climate (desert/mountain/arctic), some pretty appropriate feats, a number of new spells, mechanics for herbology and homeopathic remedies, mechanics for curing hides of various creatures to make new types of hide armor, more about selecting an animal companion (mechanics for rare/exotic ones), establishing a druid circle.
There's some nicely balanced work there; nothing I'd consider over-the-top (except maybe "Fission", which is a druid-nuke, but that's a 9th-level, single target spell).
If I had to sum it up in one ssentence (stealing from my review):
"How not to be a passive, anti-social vegetarian."