There are so many low carb foods with the transfat problem, among other things--I always read ingredient labels. Here are a few frustrating ones:
Mission Low Carb Tortillas (I emailed them and told them to use nonhydrogenated lard)
Zcarb peanut butter bars (this is such a shame. I love all of their other products and I realy hope they change their formula)
Carborite shortbread, peanut butter, and chocolate chip cookies (these really are mostly transfats, which annoys me to no end, as only the chocolate chip one has any non-erythritol polyols.)