Searching the forum for this feat name didn't bring up anything, so this might not actually be a repost!
In Dragon 315, there's a selection of regional feats for Greyhawk, which was expanded on in Dragon 319 (this latter being the source of the infamous Faerie Mysteries Initiate and Troll-Blooded). So I thought I'd go through 315's Greyhawk feats and see if anything jumped out at me.
You aren't slowed by snowy terrain, and know how to disguise your movements in the snow.
Regions: Frost Barbarians, Ice Barbarians, Perrenland, Snow Barbarians, Stonehold, wild elf, wood elf.
Benefit: It costs you no squares of movement to move into a snow-covered or heavy snow-covered square. You leave no tracks in snowy terrain and cannot be tracked. You may choose to leave a trail if so inclined.
Normal: Moving into a snow-covered square costs 2 squares of movement. Moving into a square covered by heavy snow costs 4 squares of movement.
I mean, given the finite nature of most campaign planets this doesn't break the speed record or anything, but I can't think of many movement abilities that give quite this much value for investment. Sure, it's situational, but... holy shit.
(And yes, I'm aware that whoever wrote this probably didn't intend for it to do what it does.)