We're doing a lot of Rails programming for thenewsroom; I blogged about how it's working out really well a while back.
Well, now Rich Kilmer and Chad Fowler have written a Rails app that surfaces thenewsroom's video content through Facebook. To give it a try, log in to Facebook and go to thenewsroom app page and add the app. Then you can browse around the various videos (like this one from E3) and comment on them and whatnot. The videos list gets updated every fifteen minutes or so with the latest content from thenewsroom, so it's always pretty new stuff.
More importantly, the app is built using Rails, Mongrel, and lots of other Ruby goodness. Sweet!