FromBelgium - 9:19 am on Aug 14, 2009 (gmt 0)
2. Don't do it. Write new content for the .com site and start over. Link strongly from the old site, where appropriate, and you may want to move *some* of the content, but leave the old site in place, with country specific content.
That's what I did a year ago. But soon the results for old country specific domain improved and I stopped developing the new .com site. I think that Google considers country specific domains as being global if you gave enough global incoming links. Now I almost find no difference between searches with and without "&gl=us" on google.com, wheras a year ago there was a big difference.