The TeX Math Font Generator is a set of programs that take an Adobe Type 1 font and produce a set of math symbols that look compatible with that font. The program's output is immediately usable by LaTeX and TeX.
You may download the program here.
By the way, MathGen is the name of a program for designing arithmetic worksheets. It is unfortunate that I chose MathGen as the name of my program. Hence, the full name of my program is the "TeX Math Font Generator," abbreviated to MathGen as a colloquialism.
Here's how to create new math fonts quickly.
./begin.pl, and enter the information it wants.
./rawwidths.pl, and finally
Once you've done all of the above, your new math fonts should be ready to
use. Say you chose "zzz" as your
output_prefix and "output" as your
output_dir (this is the default). Then, in the output
directory, create your LaTeX document, placing the statement:
in the document preamble.
You should move the generated font files to their appropriate places in the TeX directory structure. There's information on doing so on the FontInst page. Note that the ".ps" and ".txt" files are for the font measurements; you don't need to keep them.
Here is a random sample of mathematical typesetting in Times Roman. You can also download the font files so you don't have to create them yourself.