Post-it notes: See my other post, they are great to use in place of tweezers to place parts, they work great as small parts holders. and you can use them to protect the dial when you are working with the hands. I prefer the smaller page flags.
Nail File Buffing Bar: This one constantly gets me in trouble. Go steal your wife/girlfriends/mothers nail file buffing stick. It has 4 or 8 different coursness sides. It is great for polishing plastic crystals, or use the smoother side to buff out the cases.
Grill Skewers: These work great for pouring chemicals, or because they are not magnetic use them for moving/holding parts down.
VM and P Naptha (Painter's Naphtha): Basically lighterfluid, but a lot cheaper. I use this to bath all the parts that come out of the watch when I am servicing it.
Mini Locking Pliers: These are tiny. Around 4-inch in length. I actually bought them in a dollar bin for my kids to play with. They make a very handy vise. You can tighten down the screw to hold things. I even just used them to shrink a set of hands slightly.
Coffee Filters: These work as little bowls to keep parts in. They are cheap, clean, and effective. I have started working over top of one on my bench, It catches any screws or parts that fall. They also work great to help parts dry after washing.