What tools or tactics do you use to identify which ranking factors Google is weighting for your industry or keyword?

[AdamThompson]

Google ranking factors are increasingly more complex and less universal. Google is emphasizing different ranking factors for different scenarios.

What tools are available that can help identify which ranking factors Google may be weighting for a given query or industry?

For example, are there any tools that provide correlative analysis of Google's rankings for a given keyword?