One of the issue among scientific bloggers is the difficulty to input and show pretty math formulas on web page. I used to use third party equation editor to edit and insert into my post as picture. The appearance is not bad but it is not very convenient to switch between programs and whenever any mistake is found, I have to re-make the picture instead of modifying the existing one to correct it.
Have not get chance to try mhchem and AsciiMath yet. They all looks very handy and worth to learn late.