One benefit that a lot of commenters here have pointed out is very user-friendly inspection of running code. Kind of a super-REPL. I find that in Python I'm mos

One benefit that a lot of commenters here have pointed out is very user-friendly inspection of running code. Kind of a super-REPL. I find that in Python I'm most productive in iPython's browser-based notebook interface (or Mathematica, but I find Mathematica difficult for writing things that go into web-facing applications), which offers similar features. These notebook interfaces are REPLs, but they're a little more user friendly in the sense that you can edit history in place instead of doing a history completion and then evaluating an additional line. Has anybody had any experience with these notebook interfaces as well as the smalltalk environment and can give a rundown of the differences?