Putting these in order because some koan packages are prerequisites of others.
Feel free to put it in logical order so that


Test asserts - Message, bool, etc. (DMarsh: done)
Nothing values (DMarsh: done)
uniform access principle (DMarsh: Done)
named/default args (DMarsh: done)
Tuples - syntax  (DMarsh: done)
Pattern Matching (DMarsh: done ?? Should we add more)
Preconditions (DMarsh: Done)
Functions returning functions
Functions taking functions
if expressions
for comprehensions  (DMarsh: done)
imports, packages, and visibility (dhinojosa:In Process)
classes  (dhinojosa:In Process)
mutation
lists / cons
collections array, list (DMarsh: Done, also maps and mutable maps, sets and mutable sets)
map, reduce, filter (DMarsh: Done ?? covered in various collection classes)
immutability/side effects (DMarsh: done ?? Do we have enough here??)
lazy sequences (Nilanjan)
recursion
currying / pfa
case classes (DMarsh: Done)
Pattern Matching
traits / mixins  (dhinojosa: In Process)
type signatures (dhinojosa: In Process)
state identity lifetime
memoization
recursive list processing
lambda
null option types (Nilanjan)
reflection
scala properties - set date / use earlier date


Make sure this is covered:
scala> def pointit() = 123
pointit: ()Int

scala> () => pointit()
res2: () => Int = <function0>

scala> res2.apply
res4: Int = 123