mimetex, licensed under the 
gpl, lets you easily embed 
LaTeX math in your html pages.  It parses a 
LaTeX math expression and immediately emits the corresponding 
GIF image, rather than the usual 
TeX dvi. And 
mimetex is an entirely separate little program that doesn't use 
TeX or its fonts in any way.
TODO: put some examples here... used to be a bunch, but all have 404'ed awayFF: Also check 
MimeTexPreview for a working example of 
mimetex integration into Tcl canvas
Useful links:
AM (14 may 2007) I like that!