[grungegun]

For those interested, there is a fairly basic WYSIWYG editor for this: http://www.tikzedt.org/

It's useful to throw together basic 2d diagrams, which can then be refined later

[Avshalom]

I think there's some xfig to tikz converters laying about (xfig being a pretty limited vector format) pretty sure I've used one before with good results (though i might be thinking of fig2pdf)