Hi Folks,
I'm sure Mr. Bates would come up with a nice book on UML, but in the meantime, I would highly recommend UML 2 Toolkit by Hans-erik Eriksson. The class diagram chapter from that book is a must must read for anyone who is remotely related to object oriented concepts.
I've not found such beautiful explanation anywhere else (not even in Grady Booch's UML User Guide - but Booch's book is extraordinary if you don't know anything about UML).
Another good book is UML 2 Bible - contains tons of diagrams.
On a lighter note, Head First books in general contain so many diagrams, that I'm wondering how many diagram Head First UML would contain
Mr. Bates,
I hope you would find a new author/co-author for this project and we'll see HF-UML in near future. All the best!
Regards,
Anayonkar Shivalkar (SCJP, SCWCD, OCMJD, OCEEJBD)