Review on ElectroCookie Proto Shield Kit - Arduino Uno Compatible, Stackable DIY Expansion Prototype PCB (3 Pack) by July Sin

This is the best I've ever used. Power lines and double-hole tape are great for quick marking. The extra space is also useful when soldering multiple connectors. My only complaint is that the included 2x3 connector doesn't stack, making it a bit unusable. I like to use these pins for SPI instead of 11-13. The ground, reset, and VCC pins are connected so you can mount them female side up to get to them, but the SCK, MISO, and MOSI pins don't seem connected to anything.