But what about accessibility?
Last time I checked WAI-A asked that sites function without client side scripting, therefore the application needs to degrade gracefully when JS is not available.
For a simple application such as your units tool this isn't a real problem as you just need to add submit buttons, but for a more complex application it potentially increases the code you have to write as you have to support input with and without AJAX.
Even if we assume all browsers have JS on, then a dynamic update of text doesn't necessarily cause a screen reader to read the changed text again, leaving the user guessing as to what happened.
So while I agree AJAX can add to usability and isn't particularly hard to work with, I do think it needs to be used with care.
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