The Dritz Mark-B-Gone is one of the best tools for making, especially if the marks need to stay around awhile. The blue marks stay in until you wash them away with water. Often just a spritz will do the trick but sometimes it may need to be submerged.
The Dritz Mark-B-Gone blue marking pen leaves a bold line, easily followed or found when creating a tick for matching or cutting. Great for outlining quilting grids and designs.
There have been several magazine articles, white papers and blog posts about the various fabric marking devices. For a little information on a test of several marking pens, see out this blog. For a tip on getting the blue out without, see this I Have a Notion blog too.