I've spent yesterday evening figuring out how to create equations on my computer.
Lyx, which is supposed to be easy, just crashed. OpenOffice is a little more clumsy, but useable.
Having done it, I now can't figure out how to cut-and-paste from them into things like email or this post. I can attach documents or take screenshots, but that's pretty clunky.
Some forms are, however, clunkier than others. A simple equation that takes 10K in .odt (OpenOffice) format is 104K in Windows-97 format: a factor of 10 explosion.
If you're reading, and know how I can get equations into gmail or blogger posts, speak up.