One of those nifty little tools that just make life easier: WebEquation by VisionObjects.
Just draw your formula, and it returns the corresponding LaTeX or MathML code. For me, it works great with a cheap graphics tablet, feels a bit more cumbersome (but ok) with the mouse – but still waaay better than messing around trying to convince LaTeX to let that darn’ formula say what you really want it to say. As an example, I just did Euler’s identity in a couple of seconds. For all of us who don’t do this on a daily basis 😉
Found via SchockWellenReiter.