some of the 'tools of the trade' that make my life much easier when canning are my food mill which has been used forever.. its just the handiest item for making applesauce, plum puree and excellent for making puree for fruit leathers..
my 2 sets of tongs, one for jars, one for lids, my funnel for pouring product into the jars, 1 cup measuring cup and i also like to use a 2 cup plastic measuring cup for pouring jams etc., into the jars...(incase your wondering, i like the plastic 2 cup measuring cup, it's because it won't break when i scoop the jam out of the pot and it's flexible if i'm pouring something like relish, i can squish the sides a bit, so the relish doesn't end up on the counter instead of the jar)
i use 3 pots, besides my pressure cooker, 1 for sterilizing the jars, 1 for cooking and 1 for simmering the lids in
and last but not least.. my wooden spoon... it's got holes in it and slanted with a flat bottom... it's awesome for stirring jams or jellies, as it scraps the bottom of the pot so nothing gets stuck on the bottom to burn...