I love blue painter's tape. It is the quilter's duct tape...you can use it to:
1) hold your pattern and fabric on your light box to mark your quilting
2) mark a nice straight line to sew beside
3) put your reference notes, pictures, etc. on your wall where you can see them while you work and take it down with no damage
4) Hold your rolls of stableizer closed
5) tape your quilt back down in a stretchy state while you build your quilt sandwich for basting.
6) Mark a nice squared-up box for blocking your quilt on the floor or table wherever you block it.
7) help you pack for going to the quilt show by keeping things together and safe. (Oh, and don't forget to pack your blue painter's tape too).
Did I miss anything?