from smoothie at the postpunk forum - I'm glad someone brought it back up, because I'd meant to try it! and now I have good reason to do so, because I am not sure we can easily get vegannaise here, and nayonnaise - well, er, sucks. to me.
place 1 cup of soymilk in your blender, and blend it for a minute. slowly add 1 cup of canola oil while still blending, and then add a bit of regular vinegar + a bit of salt. you will now have the best vegan mayo on earth.