http://www.swbnetwork.com/blog/tools/google-page-speed-tool/
Google has admitted that the speed at which a website loads plays a part in its ranking i.e. too slow and it will be penalized, super fast and it's rewarded. The Google Page Speed tool will help you assess the speed of your site and what changes need to be made to improve it.
Some people have been asking me what I use to create my screencapture videos. I use BBFlashback: http://www.bbsoftware.co.uk/