Just took a look at your site.
Sounds interesting.
You might not get the same degree of detail compared to a reading
a book on the subject, but getting an overview/general knowleadge
about for example J2EE patterns in 1-2 hours which can be
obtained while driving to work is pretty neat.
It might be nice to have a diagram , but I guess you can't have it
all

after all, if you want detail you can always consult a book.
Good luck.
/Svend Rost