I've been using LaTeX for years to write academic papers. Only recently have some conferences started moving to Word. This has made simultaneous editing a pain.
I've recently started exploring what it would mean to use the experimental CSS multi-column support in Webkit and Gecko to recreate the CHI template. I've had some good luck. Although, it would make life a lot easier if they supported column-span.
The latex2rtf program might help. The result looks like hell initially, compared to the PDF, but the content, styles and images are retained surprisingly well. (Equation support is weaker.) Just load the generated RTF in Word/Writer, tweak the styles and margins, and save as a .doc -- if the fix-up is simple enough for your document, you might not even need to keep a parallel Word copy.
I've recently started exploring what it would mean to use the experimental CSS multi-column support in Webkit and Gecko to recreate the CHI template. I've had some good luck. Although, it would make life a lot easier if they supported column-span.