Speaking of DrRacket UI, one thing that I'd really appreciate is an "auto-spacer" for `define' and `let'. Let me explain what I mean. I often have things like: (define something 3) (define some-other-thing 4) (define whatever-you-like 42) .... And I like the right-hand-side to be aligned to make it more readable: (define something 3) (define some-other-thing 4) (define whatever-you-like 42) .... (to be read it with a constant-width font of course). This also happens quite a lot within `let' forms. So of course I do it by hand, but if someone has already done a tool for that or knows how to do it, that would be wonderful. I don't know how easy that would be though... Maybe something that works only on the selected lines.