How can I keep my bra straps from showing under my summer tops?

One device that works really well is the Strapper.  It was designed to keep your straps from being visible when wearing sleeveless tops and dresses, tanks and racer back tops.  An added bonus of this product is that it lifts and supports you and keeps your straps from falling off your shoulders.  Order a 3 pack right for only $15.00!