There's an interesting article on providing outside air to woodstoves over at the Green Building Advisor website. They discuss some topics that I don't recall having seen here such as "air traps".
Their big hangup with using an OAK (outside air kit) is risk of fire in a backdraft. It seems to me that is easily addressed by using metal supply duct and installing a backdraft damper like the ones use on household vent fans for bathes and range hoods.
http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlight/how-provide-makeup-air-wood-stove
Edit: now that I've read the article more completely I noticed that they do mention backdraft damper use in the OAK. They provide a link to some interesting looking ones.
Their big hangup with using an OAK (outside air kit) is risk of fire in a backdraft. It seems to me that is easily addressed by using metal supply duct and installing a backdraft damper like the ones use on household vent fans for bathes and range hoods.
http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlight/how-provide-makeup-air-wood-stove
Edit: now that I've read the article more completely I noticed that they do mention backdraft damper use in the OAK. They provide a link to some interesting looking ones.