Traffic Flow SEO

Soovle is a great free tool site that allows you to do a lot of keyword research. One aspect of this site I found very interesting and somewhat unique is there daily keyword tracking by web property (or search engine). Currently the top keywords are tracked through Google, Amazon, Yahoo, Ask and YouTube (which is now the second largest search engine next to Google).

Information from the site describes there top keyword tracking list as:

This list is the most used search suggestions provided by the major service providers and is organized by each letter of the alphabet.

The top list is compiled nightly by querying each of the completion services of the major providers. Each provider's result is treated as a vote. The votes are tallied and the terms are ordered, within a letter-set, by the number of votes that query received.