This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
A co-worker and I were cleaning out the server room and came across an old controller board with 100 3v relays on it. We started talking about what we could do with them and the topic of Arduino came up. Given that I'm totally new to Arduino, we were curious about the maximum number of relays a single Arduino could support.