I'm about to start writing something up which includes a fair number of Dynkin diagrams, and I can think of several ways of going about it:
Just draw the darn things in, e.g., InkScape, and include the graphics in the standard way.
Hack them together using the
pictureenvironment or tikz, as this person suggests.
Abuse the feynmf package, possibly with defining new kinds of "propagator" lines.
Anybody have experience with this sort of task?