Sean Baker has done the obvious thing: As users are desperate for books on Orbix, why not reuse the Orbix Users Guide and write a book? It is purely a rehash, so unless you have a pirated version of Orbix without the manuals, its worthless. Whole paragraphs are identical (whole chapters, I'd say), No "dirty" tricks (And they exist, trust me) (Or hire an Iona consultant, they are quite good), nothing about name services, nothing advanced... Suitable for college students, not for professional programmers (Oh, by the way, it needs an update). A waste of money and time...