This got me thinking about some of the more unusual things I use, and I thought I'd make a short list here showing off some of the oddball tools that serve me well!
1. Telescoping magnetic wand
These magnetic pick-up tools can also come with a light (like mine) and can be easily found in the automotive department of your local hardware store. Handy for dropped and missing pins that end up under your sewing table. And for getting in between the wall and your cabinets!
2. Plant cover fabric
I buy huge packages of this at Dollarama to trace my pdf & Burda patterns -- it's cheap, easy to see through, and takes a ballpoint pen nicely. It is a little harder to see your pattern notations on this than it is on tissue, but on the other hand this stuff is sturdy! It reminds me of interfacing. You can't iron it unless you use low heat and a press cloth though - it will melt on to your iron otherwise. Heads up.
3. Crayola Washable Markers
Even though I do have a Frixion pen or two, these wide Washable Markers are handy for marking pattern notations on the wrong side of fabric. I like how quick and easy they are to use with basic cottons or any smooth fabric. And they almost always wash out well (NB: Test First!) They are helpful with darts, notches, etc. Even with embroidery!
And in new & strange tools that I don't have yet -- I want to add a tape dispenser clip to my arsenal soon: my husband saw one at Michaels, though they are also available at Staples. It should make taping together pdfs much quicker, if the tape stays put on the edge of the table.