Good old Martha taught us that rather than buying those ridiculously expensive anti-slip mats for a rug, just turn it over and run a few lines of acrylic-latex caulk every 6 inches or so. Let dry and flip over and your rug wont be going anywhere!
This tip has saved my brushes many, many, times. Thanks to Laura Cox of Heart of the Home Stencils who first led me to Murphy's Oil Soap! "If you petrify a brush just soak it in Murphy's for 24 to 48 hours and it dissolves all the paint and makes it like new."