Thanks for all your responses and comments about your favorite tools. Some have been surprising!
Here are few that have been mentioned:
Don't forget to check out the Trail-Marker GiveAway and let me know what your favorite tool is!
AS FOR ME..
I've been using one of my favorite tools this week. It is the one that I carry around with me in my pocket while working on quilting and beading.... Shown is a picture of my beading kit....with my fav tool kind of hiding on the right, the chaco-liner. I use it to mark out areas to be quilted, or block out shapes for quilting, or as in the other two pictures here...I note where beads may need to go before picking up needle & thread.