A good trick is to listen to the water boiling. At around 180°F the water starts bubbling and dancing, gets a bit agitated and might make a resonant sound in your kettle. I suggest using a thermometer and getting to know how the water sounds at different temperatures.
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When I boil water in an open pot, I can usually recognize the different temperatures by the way the water shimmers, the size of the bubbles, etc. Do that a couple times with a thermometer, and you can probably eyeball it from there.
I heard that you should boil the water first, and then let it cool down. The listening method only works when you don't boil it, but go to the desired temperature without a detour.
What is the source of revenue on the site? Just ads? (I know this has nothing to do with community. Just curious since you mentioned that you are almost profitable.)
That's an important point, thank you. I definitely have had the experience of wondering, "Is this something LaTeX provides, or is it from Memoir?" I guess I should also have been asking myself what comes from LaTeX and what is already part of TeX.
Your Rails analogy is apt, I definitely remember being a Rails n00b and not knowing what was part of Ruby's standard library and what was provided by ActiveSupport.
