mathaddons.com
math expressions
made easy
IguanaTEX This Windows PowerPoint Add-In adds full LATEX support for PowerPoint. This full support allows for greater customization (for font selection and color) as well as additional features (such as vector figure creation). However, the learning curve is consequently steeper, and additional software downloads and configurations (outlined in their documentation) are required. Still, this excellent product helped inspire our project. To make my lecture slides, I use this in conjunction with SymbOffice just about every day.
TEXsword A product similar to IguanaTEX, but for Microsoft Word.
LATEXiT A product similar to IguanaTEX, but for Mac, and not limited to PowerPoint.