Well, I'll respond to my own post to get things started.. I missed the UA 'Round the World' award option, since it is listed at the bottom of their page.. http://www.united.com/page/article/0,6722,1142,00.html. Anyway, per this, it is 200,000 miles for economy travel. There are no specifics, though, as to the number of miles you can travel, etc...

I suppose I'll have to call UA to get details.. if anyone has any information, would be appreciated!