When I do a search for my main keywords on Google my site seems to be the only one showing a date "Mar 4" after the URL. I have not seem that before and wonder what, if anything, it means.
look at the top right of the window, if it says you are logged in with your google ID, ie. your gmail account, it is because google tracks your sites etc.. and delivers personalized results. It will tell you the date and visits next to a website in gray. If its the green date next to the UIRL it is the date of the latest cache of the page.