If you were happy to pay a certain price for something, then that price should be based on the long term cash flow from that investment. If you were happy to pay 2007 prices for shares (which i wasnt hence why i wasnt in the market in 2007) to generate long term dividends based on 2007 prices then you should be estatic with the prices being offered in 2008.
If you are saying hang on a moment there are all these risk factors appearing in 2008, then your assumptions based on 2007 prices were optomistic, and you should be evaluating your own ability to value the intrinsic value of a share rather than trying to forecaste whether we have hit the bottom.
As i have been saying all year, who cares what the indicies are doing. I am looking at investing in specific companies, not the indicies.