Excellent book. If you really want to learn something about the subject, that book is a great place to start.
I'm not sure what market the OP is considering low right now...I would consider most of the major american indexes slightly overpriced at this particular moment.
I think buddreams has it right, march may have been the bottom. I suspect the dow has likely peaked in the short term. In my opinion, the easy money has already been made this year.
That's not to say there aren't bargains to be had for someone willing to do their homework. Just my amateur opinion...And I would avoid gold/silver.