I don't trust websites that allegedly measure whether it's time to buy or sell, and those that measure the greed factor more or less accurately seem to do it in hindsight, which isn't very useful.
I agree with Zaguru12 and many others about the DCA as a reasonable option for investments. It's easy to do, a popular strategy, and you sort of win some and lose some because sometimes you invest at a good time and sometimes at a not-that-good time, but it's alright in the end. Of course, everyone should do what feels right to them, and it's totally reasonable to just watch the market for some time and then decide when to invest, how much to invest and which strategy to use (if any).