2-for-1: Q2ID & ID2Q — Convert InDesign Docs to QuarkXPress & Back Again

Through December 31, XChange UK will give you both of Markzware’s unique page layout translation utilities — Q2ID & ID2Q — if you buy ID2Q for £162 ($256). Use them to open files from QuarkXPress in InDesign, and vice-versa. 

Of course, the translation isn’t always perfect because of different feature sets and text flow engines, but it comes very close.