Web Site Monitor Description:

Knowing how your web site is performing is essential to retaining your competitive edge. Our Web Site Monitoring tool provides you with the ability monitor your site 24x7. Furthermore, it's a tool that is easily deployed. Here's what you get:

A Microsoft Excel spreadsheet that uses Visual Basic to 'drive' Internet Explorer based on a script that you provide (in Excel),
Set thresholds,
Send an email when a threshold is exceeded (you can provide HTML tags too),
Perform validation -- does the page you are monitoring contain the proper text?
Send an email when a validation error occurs,
View the response times in real time,
The script is a 'transaction'. For example, login, go to the product page, click 'buy', logout. Each step response is captured and the overall transaction time is captured,
Because the interface is Excel, you customize the look and feel,
Full source is provided.