Java classes to UML diagrams. ObjectAid

Some time ago I found a cool tool for Eclipse, ObjectAid.
It can build UML class diagram from your source code.
After installing through Eclipse's "install new software" you can create a new ObjectAid's file and just drag and drop your Eclipse classes on this diagram.
After that the program computes relationship, inheritance and so on.
Very useful for sorting out foreign code.
There also sequence diagram screenshots but it is not released yet.
Well, looking forward for this very useful feature!
BTW, it works with Eclipse 3.6 Helios too.