MON.ITOR.US offers free webanalytics solution releases a free webanalytics tool and offers a free upgrade to its monitoring services.

The service provides instant visual feedback about KPIs of websites such as uptime statistics, access speed from multiple geographic locations, visitor tracking and page view statistics. The combination of web traffic, site uptime statistics and page load speed makes the service unique; the aggregated metrics provide more insights about website capacity and usage - for example diagnosing load issues during peak hours.

I definitely will use this service for up- and downtime alerts, which will be sent out by email. For any SEM/SEO will also be a great tool to monitor competitors.