I'm finding the following useful for the ATPLs.
Oxford Meteorology CD-ROM
Oxford ATPL Exam Preperation (2500 questions on CD-ROM)
For the technicals there is a 4 book series called "The Commercial Pilots Study Manual Series" written by Mike Burton. I bought these many years ago (around six) and my PPL instructor back then said they were really good books. Mike Burton was his ground school instructor... hehehe.
Best wishes,
Charlie Zulu.