As apple has only released wifi models of iPad till now, which does not have 3G. So, Everytime you want to read feeds and browse you favorite websites on iPad you would need a WiFi connection.
In this case you can use the free app called Offline Pages on apple store, This app allows you to save entire web pages, including formatting and images, and read them offline on gorgeous iPad screen. To save a page for offline reading, simply tap the button while casually surfing the web using built-in browser. Better yet, send a link from any PC, Mac, or iPhone directly to your iPad using a handy bookmarklet.
This app supports all kinds of web pages, PDF and Word documents, secure HTTP, and all image types.
Offline Pages [ Apple Store Link ]