I'm currently deep into writing the follow up to Electronics for Magicians, called
Digital Electronics for Magicians. It's packed with techniques for adding that certain something to props and effects using a tiny robot controller (example: controlling a servo interactively with a variable resistor
http://www.youtube.com/watch?v=AN4LEc5iQLQ" target="_blank) . I'm including some full projects, but I'm looking for more. If you have an idea for something you'd like me to cover, drop me a PM. There's a free copy in it for anyone whose idea makes it to print.