Inspiring Quilters, Stitch by Stitch
I also use the Frixon pens---not had any problem with the marks returning. But, then, I live in Arizona!!
I like chalk for marking quilts - it's maybe a little too easy to remove, but as long as you're not marking a huge, detailed area, the chalk wheels work great.
I usually use a microfiber cloth to rub off any remaining marks before I iron. I have had problems with the black lead on light fabric.