GG Prop Platform Stackable headers available _NOW_ from The Shoppe

http://www.wulfden.org/TheShoppe/accessories.shtml
and scrolling down to "Stackable Connector Sets." I also have available stacking header sets for standard Arduino and the new Wiring-S board (ATMEGA 644P).
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I'm really pleased to see that you've got both the "Stack-able Connection Sets" as well as the mini breadboards. These are perfect for the Protoplus boards.
I've been chopping 6's into 4's as well, and have just found out you can buy 4s already made. Futurlec.com and search for "stackable". 20c each http://www.futurlec.com/ConnHead.shtml