When using myList.length() you will get an error message similar to this one
[INFO] Compiling 10 source files to /.../target/classes at 1317721118837
[ERROR] /.../src/main/scala/code/lib/MyLib.scala:216: error: Int does not take parameters
[INFO] var listLength = myList.length()
What the error means is that length is not a function, but simply a property and you should use myList.length and not myList.length()
Creating an empty box in scala lift is not hard, simply fill it with None.
var emptyBox:Box[MyThing] = Box(None);
If you need to use the session id of the current session then it can be fetched from S.
The favicon.ico should be placed in the src/main/webapp folder.
Even a blank file here with no content (but the correct name) will stop the server complaning about the favicon not beeing found and that is one less error message to worry about;)