Completely disagree about Ruby on Rails, the experience of using happstack ( http://happstack.com/index.html ) blows it out of the water.

The RAM Cloud database is really natural to use; it eliminates problems like object-relational mismatch and SQL injection by letting you do everything in idiomatic Haskell.

Plus, the type-system, monads, and algebraic datatypes make it much easier to write clean, correct code. Albeit, only once you've passed the learning curve.