Lately – within the last two days – I've noticed that all of my Adwords campaigns have suddenly jumped to the top of the rankings. From being at an average position of 6-7, I now have an average position of 1-3. I'm obviously not complaining about this but would like to try and understand how this has happened. I have made absolutely no changes whatsoever to my account settings. My feeling is that Google may have tweaked their algorithm. Has anybody else experienced radical changes – positively or negatively – since 11 June?