My trading systems don't directly rely on accurately predicting general market direction, but it would be helpful, to say the least. I wrote a piece here on the novel Paradigm, by Robert Taylor. He also runs a web service that updates predictions from his market timing discoveries, here. This service called the rally into last Monday and the subsequent decline since then. Impressive.
The timing service used to be a fee-based service, but now is free to anyone who buys the book Paradigm from the website. Buy a book, get free (and so far impressive) market timing advice.
Maybe worth a shot.