A command line tool that will go through your ruby program and narrate what is happening, much like a teammate seeing your application for the first time would, then run the program and, if any error occurs, will curl a stack overflow article relating to the error to your prompt for quick viewing.
Create a tool that helps eliminate the gridlock phase of development (something is broken and all you need is a second pair of fresh eyes to take a glance at your code)
Get immediate help from stack overflow so you never have to leave the command line (there is no place like home the command line)
Ruby specific lexer so narrate what is happening in your program
Error reported that hits the stack overflow api for program-specific errors
Easy to use user interface so that users can use it quickly and often
Shout out some suggestions or features, I'm all ears. Or help me work on it, that's always fun too.