I would like to be alerted if my site is down (for example have an email sent to me).The site is written in asp .net  it is deployed on a dedicated server, windows 2008 with IIS 7
How can I know if my site is down?
monitoring
we use Pingdom, there is a Free plan, it checks your site every 5 minutes, but you can check only one site, url : http://www.pingdom.com/With BasicState you can check unlimited number of sites and check frequency is 15 minutes, url : http://basicstate.com/Update: There is another great site: http://www.monitor.us/free-IT-system-monitoring