I recommend taking a monthly screenshot of all of the following SERPs. A screenshot is an easy way to gather a lot of information. The image files contain data on when they were taken so they are easy to organize. I recommend you do this for the following - Google Local SERP - Google Main SERP - Google Webmaster Tools - Bing Maps SERP - Bing Local SERP - Bing/Yahoo Search Webmaster Central Other minor ones: - Ask Local SERP - Ask Main SERP