Peepel is an interesting site (beta) which can be best be described as Google Doc's w/out the "real-time" collaboration. However, there are some nice features to it which u can see by reading the comments below. It is a place where you can create/house your documents online and view them all in one window.
This feature which allows users to view multiple applications in the same window is exactly the reason I like Peepel so much. Not only can you view, documents in the same window but also web pages, calculators, etc.
Also, it's very easy to use and sign up, just register w/ a username and password, confirm the validation email, and then click on the Peepel icon in the upper left hand side of your browser's window and you are good to go.
Below is an example video from their website.
Click here for more info.