[ale] diff on 2 directories

[cfowler at outpostsentinel.com (Chris Fowler)]

Are there any good tools to do a diff on two directory trees?  I'm doing 
an upgrade and there are many perl programs spread throughout and I want 
to see the differences.  I've used the diff program before but these 
trees are big and there will be a lot of noise.  There are binary files 
as well as text files.