Another one of those "duh, why didn't I think of that?" tips: When painting, wrap a rubber band around the can over the opening. Then you can dip in the brush and wipe the excess paint off onto the rubber band, rather than the edge of the can.
I HATE brush-stroke marks. For painting furniture or cabinets-- add floetrol by sherwin williams to your paint when painting furniture or cabinets and it will take away all of those brush stroke marks and leave the paint smooth.
Crinkle Painting Technique: Crinkle Painting Technique This speedy-to-apply finish involves mixing paint with glaze, applying it over a base coat with a roller, and then pressing, bunching, and partially removing the mixture with sheets of plastic.