Now, you can make your detailed site stats public, using Pingdom Beta. Pingdom is one of the best site who provides uptime/downtime reports.
The current version has a few features like Uptime percentage, Downtime and Average response time. This is quite simple and non-graphics. I have attached an image of my site as example.
Where as new Pingdom report (public) has a lot of features and is detailes graphs, which makes it much attractive. This beta service is now available for all users.
I have made my blog’s stats public. Visit here to see live stats of netrival.com.