Submitted by Steven Spencer on Sat, 01/05/2013 - 13:57
This screenshot displays a long term date range with number of pages indexed (grey), crawl errors (in red), an appearances in search (blue). This data is from Bing Webmaster Tools
Submitted by Steven Spencer on Fri, 12/21/2012 - 14:18
Sitemap.xml file can be included in your robots.txt using this method. This will allow web crawlers to find your sitemap easily.
Referenced from: http://www.sitemaps.org/protocol.html#submit_robots