[thackney]

Shell has a couple of facilities doing this, in Qatar and Malaysia on large scale commercial operations. It just is not economic (yet) in the US.

http://www.shell.com/home/content/aboutshell/our_strategy/major_projects_2/pearl/overview/

[Okieshooter]

Also this company is working on doing GTL on a small scale to move stranded gas for fields that have no pipeline access.

http://www.synfuels.com/