Wouter van Ooijen wrote:
| What would you recommend as vector drawing tool for things like block
| diagrams, signal sequences, simple mechanical pictures, state transition
| diagrams, etc? These are meant to be imported in a word document, which
| eventually might become a book. Must be scalable, so no pixel drawing.

For diagrams I have used XFig for a long time, then I tried Inkscape,
which had too many features for me, and finally I have decided to use 
Ipe (http://tclab.kaist.ac.kr/ipe/ ), which allows me to easily integrate
LaTeX formulas with my drawings.

For signal sequences I often use the "drawtiming"
(http://drawtiming.sourceforge.net/ )

All mentioned tools are free and open source and generate EPS and/or PDF
output.
-- 
HTH, Wojtek
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