There are several useful tags I would like to see supported in Print Text 
field of breakpoint customizers:

{callingMethodName[0]}, {callingMethodName[1]} etc to log the callers of the 
context method. I tried to something like this:

{=new Throwable().getStackTrace()[1].getMethodName()}

but I keep getting an exception. I will file a separate bug for that.

--

{classLoaderName} - name of the class loader of the context class.

{classLoaderToString} - toString value of the class loader of the context 
class.

--
Similarly abilty some function like this:

{uniqueID(variableName)} or {uniqueID(this)} where unique id is the id 
returned by:

http://java.sun.com/products/jpda/doc/jdi/com/sun/jdi/ObjectReference.html#uniq
ueID()