Drawing network diagrams?

[Joshua Judson Rosen]

I recently did some some network diagrams at work with Dia, but
I'm wondering if there are other diagramming tools out there
that I should consider.

What do you all use? Is there a better tool? Is there a more standard
digram-format than Dia's? Is there a specific package of icons
that I should get for Dia?

-- 
"Don't be afraid to ask (λf.((λx.xx) (λr.f(rr))))."