I have made an iPad app called "Side by Side" and would like to recommend it.
The idea is very simple: just cut the iPad screen into 4 parts. In each part you can browse webs, take notes, download and read files.
I like it because in many cases you just need the iPhone size screen, for examples, browsing news headlines, checking facebook or email updates, writing a short paragraph. With this app you can do several things at the same time, without switching back and forth.
There are some other things you can do with it, like reading two documents side by side and compare, or opening two web-based games (the startup page provides the links to several interesting games) and playing with your friends.
This one also supports file downloading and some more cool features.
Is anyone interested?
App Store Link