If you use StarOffice, get it and save some time. The Complete Reference 1st ed. This is a new book that's a newly popular reference for beginners, but I haven't had a time to look at it fully. This book is a good introduction for people new to Unix. It includes information specific to Solaris.
Topics covered are shells, editors, nroff, source control, make, and debugging.
This book is our bestseller. It is an excellent Solaris-specific book on System Administration, it's gives a lot of practical information without being too technical. Unix System Administration Handbook , 2d ed. This book by far is the best book for Unix system administration in general. It's dated, but a lot of material, especially on Solaris x86 setup and configuration, still applies.