Great looking site and tool, I'm going to dig into it.

If I might start slinging feature suggestions right off the cuff:

- I'm very used to using Cmd + Enter to "submit" a text area and you have Shift + Enter. If I'm alone in expecting something different then of course you shouldn't change it, but if I'm not you might want to consider changing it.

- Let me set the number of spaces in a tab. I'm used to two and while looking at four isn't a game breaker, why tire out my fast thinking brain #1 trying to parse something unusual? I would like to control it.