Yahoo has recently launched a new tool called Yahoo Clues. It is basically a keyword tool designed to give an insight into the demographics of people searching for the keyword along with the popularity of keyword over a period of time and additional keyword suggestions.
Yahoo Clues shows the graphical representation of change in keyword popularity over the last one month without giving any exact numbers. Its main use lies in the predicting searches by gender and age, income level and geographical location. The Search Flow at the bottom of the page can also prove to be useful in determining user’s search pattern. It basically shows you most probable previous and next user searches for a given keyword. You can enter two keywords to compare them.