HipMojo points out a metric I never used before, but makes a lot of sense to examine.

The Propensity to Search is an estimate of how likely a visitor to your site is going to use your internal site search.  Here’s an interesting analysis that was done for the new MySpace Vertical Search announcement today by HipMojo and announced to me by John Battelle.

The number of search queries anyone who has access to their site analytics can figure out - HipMojo was trying to guess what MySpace.com’s search queries are, as well as some other business metrics.