Consider some of the strongest cash generating businesses in the world: Apple, Google, Microsoft, and RIMM. Their P/E's are not that high considering the returns on capital that they generate. Furthermore, their P/E's are lower than they appear at first glance, as after adjusting for their cash balances, these companies appear even cheaper. The chart below illustrates this, by showing these four companies (along with cash-rich KSW, a company we have discussed as a potential value investment) with their P/E's after adjusting for their cash balances:
It is rare that a collection of cash-generating cash-rich companies such as those listed above are trading at such reasonably low P/E's. It should, however, be noted that on its own the P/E ratio does not convey enough information to determine whether an issue warrants purchasing. However, the higher the P/E, the more earnings must grow to justify the price, and the more the stock price will fall if earnings growth does not come to fruition. This is why value investors prefer stocks with low P/E's, as low expectations lower the potential for loss of capital and raise the potential for price appreciation.
Disclosure: Author has a long position in shares of KSW