Make:

Todbot has a short and sweet how-to on making prototyping Arduino bread boards for portable development platforms, he writes - "Do you love Arduino? Do you think the concept of Arduino shields is just the coolest? Do you wish you could get some of those neat Arduino Prototyping Shields that Tom Igoe made? Too bad no one sells them yet, because building your own versions of those boards is a bit out there for us ADD'ers. Don't despair, there is a solution to the lack of breadboarduinos. You can build your own Arduino shield with a solderless breadboard in about 10 minutes and 10 bucks. It's not nearly as full-featured as Tom's prototyping shields, but it's great way to quickly add a solderless breadboard to Arduino. " - Link.