I believe it was WOTC themselves, in Dungeon Magazine. I think it was more than one issue, but issue #89 comes to mind. Also, I believe several Dragon issues covered it.
<does a quick google search>
Yeah, here it is:
Red Sails: Bright Sun, Mother Earth Dragon #290 (Dec 2001)
Red Sails: Fell and Forlorn Bestiary: Monsters of Eastern Europe Dragon #290 (Dec 2001)
Red Sails: Tempests on the Steppes Dragon #290 (Dec 2001)
I would bet there are more modules and campaign setting info out there as well.