You can use idownloadall app in order to shared networked files but this can be done individually. Then you can open the files with whatever app that you have using the "open with" and then scrolling through the table of apps. Make sure that you scroll down, because I made a mistake in assuming that the displayed list of apps is the list of apps that can open the file.
The best application that can be used for sharing with an iPad should be the Sugarsync. Sugarsync is a cloud sharing application. It can synchronise your files with the cloud as well as all other computers. The best thing about Sugarsync is that you can choose any folder or file to sync, unlike dropbox. Sugarsync is also more intuitive than Microsoft Skydrive Synced storage, because Skydrive will immediately assume that you want to sync your folder to its default folder somewhere in mydocuments folder.
Sugarsync also can work with iPad unlike Skydrive and Google Drive. Google Drive is similar to Dropbox in requiring a dedicated foler to syncing files. Because Sugarsync synchronises entire folders, you don't need to specify which file to upload or update, unlike idownloadall.
iTune is also not ideal because it can only sync with one desktop PC at one time. If you change your desktop PC, it will delete all the files in iPad to be replaced with that on the library of the new PC. The library is controlled by iTunes installed at the PC. I have lost many files on my iPad this way, even when I chose "cancel". The bad thing is that your iPad is not the master, the PC is. To be safe, download all purchases and link all files in the iTune library before syncing with the iPad.
I have also got the 5 in 1, ipad camera adapter. It can work with cameras directly via the USB port or read the photos in an SD card as well as other memory cards supported by this card reader by selecting the right switch on the adapter. It can only work with USB keyboards despite an error message that the attached device is not supported. I just ignore the message and proceed with using the devices without any problem so far.
