When you have a blog or website with very high traffic, it is always good to have a monitoring service. A desktop based monitoring tool with custom time settings would be the best way to check the availability of websites. Growl Site Monitor is a freeware tool, which is designed to work with Growl for Windows, which will monitors any number of web sites by requesting page content and verifying that it returns the correct content.
Growl Site Monitor has a config file which has the settings and the website information to monitor. The application provides a sample config file which can be edited using notepad. You can enter your own custom time for monitoring which can even in seconds.
You can also manually check the site availability by clicking the Check All Now button. Growl Site Monitor is a pretty useful site monitoring tool for Windows.