New Relic is cool
New Relic is a web tool that monitor the performances of your web server, including web pages load time, database performances, availability and so on.
Here is the main panel (free account):
It’s cool, really. It gives you a complete way to check instantly the state of your applications, whether they are made with PHP, Java, Python, .NET or Ruby.
Plus, they’re nice guys! And they give a you a t-shirt, for free!