Basically the tip allows you to download a pdf direct from your browser and save the file directly to your iDevice. You can also download a webpage. To do this you will need the application GoodReader on your device.
One you have found a PDF document you want to read, for example I have a simple pdf file here : http://www.geekcomputers.co.uk/docs/evernotedbissue.pdf
When you then click on the link you will leave the browser, Goodreader then opens and you can view the PDF in the application, and while you are reading the PDF it will be downloading and saving the file on your iPad. This works the same way with webpages, so g/ will download the site to your devices
I am always interested in feedback so please feel free to add any comments, or you can mail me here. If you would like to submit a quick tip with full credit and links back to your site then also feel free to contact me.