easy display system?

I've got a nice, but complex system working, for which I
now feel I need a higher-level view for tracing its operations.  
I've figured at various points in execution certain lists that 
would be useful to see sometimes.  Currently the only way 
I know is to read and write to the console.  Certainly very 
easy, but I wonder if there's another way that's also easy, 
but not so scrolly.  Plain message boxes would not be sufficient, 
as I'd need persistent access and copy/paste.
 
Alan Baljeu