For migrations see Scala Migrations
Lift has no builders (yet), but I think play framework has that. However Lift is probably the way to go if you are developing enterprise sites.
Lifty is a builder/processor for Lift
For an introduction to Lift have a look at Lift in Action (prerelease) and The Definitive Guide to Lift: A Scala-based Web Framework. The latter is also avaliable at Google Groups see file "master.pdf"
