The makeldif utility by Sun is quite cool and usefull. Here is the documentation for it:
http://docs.sun.com/source/816-6400-10/makeldif.html
It would be nice to have a GUI for this tool in LS. The engine itself can be written from scratch or makeldif integration can be provided.
I just want to be able to right click an ou and say load this with 10.000 user entries.. :-)