Drafting Legislation Using XML at the U.S. House of Representatives
At this point, the House has been using the XML authoring environment for House-only resolutions since January 2001 and began drafting bills in XML in September 2002. The House plans to draft over 95% of introduced bills in XML by January 2003.
Check out xml.house.gov to see what the U.S. legislature has been up to with XML. If you are in DC, there is a presentation next week about their efforts as well.