The FoilTeX is a collection of LaTeX files for making foils.  A number
of features are built-in including large sans serif font as normal
font, options for setting normalsize at 20pt (default), 17pt, 25pt or
30pt, new macros for starting new foils, for special environments like
Theorem and Proof, simple macros to control the headline and footline.
With Rokicki's dvips or Y&Y's dvipsone, it will even rotate individual
foils easily.