We just got a question about this, and thought it would be a good idea to post these resources. If you know other resources for keyboarding math, please add them to the comment section...and thanks in advance!
Intellitools is for elementary level only. Equation Editor is usually within Microsoft Word- Here's one site that tells you where to find it.
Math Pad at Intellitools
Abacus Math Writer
We also just heard about Virtual Pencil Algebra, a program that was developed for blind students and has a read aloud function.