[hebz0rl]

You could try tikz with latex which works very well and is very slick: Example Gallery: http://www.texample.net/tikz/ Handbook: http://mirrors.ctan.org/graphics/pgf/base/doc/pgfmanual.pdf

[vit_tucek]

I've once redone a simple Metapost diagram in TikZ and was surprised how similar these languages are. At least for such a simple task that it was.