As far as published books, there's not much out there yet. There is Complete Java 2 Certification by Phillip Heller. The material in the book seems solid, but three words of warning. Although Complete is in the title of the book, it is far from complete. There are many SCJP topics that are not covered or are covered, but incompletely. The accompanying mock exam is not representative of the actual exam. And lastly, the exam simulator on accompanying CDROM is full of bugs, errors and typos.
There are also a few online books that are definitely worth a look.