注意到美国物理学会（AIP）推出了一个 iPhone/Touch 应用，iResearch：

iResearch is an offline e-reader that enables users to save PDF files locally to their device and view them offline without a Wifi or cellular connection. Users navigate through the journals, the volumes and issues to select an article they wish to read. A user will be automatically logged in with their institutional IP Address if they are online within a qualifying address range, or he/she can enter their username/password to obtain access. When the PDF has been loaded to the device the user can select to save the file locally onto the iPhone/iPod touch. Once the PDF is saved locally the user can read the article off-line.

只支持 AIP 自己的期刊。这似乎只是人为的限制。如果有一个应用，能支持大部分主要期刊，又结合类似 Zotero 这样的文献管理工具的话，就更有用一些。