Documentation, Documentation. Documentation.
It is always critical to document progress is a log book. If using an electronic tool like Evernote or a Blog, it can be difficult to document equations or calculations you’ve made in a project.
Vision Objects has put together a demo tool that allows for writing your equation in freehand which then uses image recognition to covert into LaTeX code.
For convenience, there is a direct link to WolframAlpha to calculate the equation. A preview of the LaTeX Equation is provided by the open-source MathJax javascript rendering engine.