Issuu web based PDF viewer renders slides as images instead of Adobe Flash - this is useful as it will enable people to view your PowerPoint decks on mobile phones or inside web browsers that do not have Flash plugin.
MyTextFile is an online text editor that also supports full screen mode for distraction free writing. You can log into MyTextFile with your existing Google Account as it is built using the Google App Engine.
The traceroute command, known as tracert in Windows, helps you figure out the amount of time it takes for your computer to reach any website. You can also identify the path taken by Internet packets to reach the destination server starting from your local machine.
amazon-reviews Amazon.com is a perfect place to read product reviews from real customers. If a product is popular and has too many reviews (like an iPod or a digital camera), you can use Pluribo to instantly summarize all these customers reviews into one short paragraph.
Sensible Units is a web based unit conversion service that helps you visualize complex units and measurements using real and more sensible objects like CDs, golf ball, Harry Potter books, elephants or even AA batteries.