I don't think it's the fastest roller coaster in the world but it's pretty BA!

http://autos.yahoo.com/articles/autos_content_landing_pages/1368/ferrari-previews-the-gt-roller-coaster/

Also I sooo wanna take a road trip to so ride this coaster for obvious reasons

http://www.ultimaterollercoaster.com/news/stories/20090826_01.shtml