latex in ps via psfrag

I'm guessing TeX will meet most layout needs. For example,

    > I just discovered the \over command, which will generate
    > fractions in TeX and LaTeX. \frac only works for LaTeX. I
    > will make tex/latex an rc param if you want. Let me know.

frac was the only use case I thought important. If over can do it I
am fine leaving it as TeX. We can generalize later if need be.