Swooze suggested we talk about our favorite quilting tool. I have many - I love my Roxanne thimble, my rotary cutter and my many, many rulers but I think my favorite - or at least my most frequently used - is a simple roll of blue painters tape.
I use it with my longarm to mark the beginning and end of pantos. I have it on my sewing machine where I have it marked so that I can do 1/2 square triangles without marking them.
I keep it in my travel kit so that I can mark 1/4 inch seams for my students. I am currently teaching a jacket that requires 1/2 inch seams so I mark their machines for that.
I have been looking at the tags that are sold to mark blocks, rows, pressing direction and I have realized that I can use a small piece of tape and a sharpie (one of my other favorite things) to mark them. I can use the money to buy other tools or fabric instead.
I really love blue tape!