I have found that selling in Canada has noticeably increased my orders. This is because the item gets listed on EBay.com and Ebay.ca as well. I sold 3 iPods to Canada within 10 hours. Nice.
The downside, is that shipping there is darn near impossible for someone who has never done it before. USPS wants a special envelope, and cost more than UPS. With USPS, I can use my normal packaging, but I needed an extra Global Commercial Invoice I had to download from the website. I needed to fill it out with all sorts of information that I didn't actually have until i called UPS back and had someone walk me through how to fill it out. Now that I figured it out, I will make an easily edited one on my computer so I can just changed the information of the buyer.