Tire 265-75-R15 Yokohama Geolandar I/T Ice and Snow tires
Date Used Winter 2009, Winter 2010/11
On Road (dry & wet) Fairly quiet for a snow tire on dry pavement. Very good grip on ice. Has worked well in slush and standing water as well. Rarely activates ABS at slippery intersections.
On Road (snow) Very predictable handling, excellent traction, even when pushed hard.
Dirt Trails Only used them on snow-covered dirt trails - useless at 30 psi, good at 20psi as long as you're careful of the sidewalls.
Rock It would be silly to use this soft compound on rocks...

FYI: this tire seems to grip just as well at 50% tread, as brand new. Must have to do with the compound.

Tire 33x1050 15 BFG Mud Terrain KM2 (pizza mudders)
Date Used spring/summer/fall 2009
On Road (dry & wet) Traction and handling are predictable on dry tarmac, average handling on wet - tire noise is slightly quieter than average (in my experience) for a mud tire.
On Road (snow) This is NOT a snow tire. On road, expect ABS to cycle a lot. Traction is not great unless the snow is deep. The BFG AT is better in snow, IMHO, if you have to have a do-it-all tire. Better yet, get a real snow tire and save your MT's for more appropriate usage.
Dirt Trails Excellent handling and traction on dirt.
Rock Low speed traction has been good, on both wet and dry rocks, so far.