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A list of most-used iPad apps has to include Tweetbot, as I am frequently on Twitter using the app. The display is stunning and easy to read, and the touch interface makes it my favorite way to use Twitter.
I capture a lot of information online to read when I have time, and Instapaper is a great way to do so. I can flag any web page or article for Instapaper, and find it waiting for me in the iPad app when I am ready to read it.
The app interface is very good, and the service works with other iPad apps allowing me to capture information from those apps for reading here.