Does any ruby/rails IDE have breakpoints?
Breakpoints are HUGE for me, the ability to stop your program in mid stride and view, traverse, and manipulate data and variables ala keanu reeves in the matrix.
"Ruby Debugger. Single-step or run through Ruby code, set breakpoints, look at local variables, navigate the call stack, switch threads, and evaluate expressions by just hovering the mouse over the variable in the Editor. There is also support for the "fast debug" extension."