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If you want to transfer files without using iTunes, then files-finder edition app can help you. It supports cloud mediums such as DropBox, Sugarsync and Google drive.
Besides using cloud storage like Dropbox or ICloud, it is possibile to use 2 free products available in Apple Store: USB Disk and Fileapp for limited file transfer. I have a problem with Itunes as my Ipad do not have a camera and I download a lot of photos and images from the Internet.
As the device do not have a camera, Itunes simply ignore them and do not syncronize the downloaded images. The only way I found to get the images out of the Ipad without using cloud based storage was using both products above... But as they are limited in functionality, it is better to use ITunes to perform a full backups of the device and use them only to copy specific files. I quit using my notebook an year ago but in some cases it is still a chalenge to do some idiot tasks....
There is a more elegant solution than using iTunes, although it also makes use of iTunes underneath, which would still be a problem for you if you aren't allowed to install it. You can use iCloud as long as you have iOS5 on your iPad and updated iTunes on your PC. You will need to also install the iCloud control paney for windows on your PC. I assume the process is similar for Macs, but since I don't have a Mac at the moment, I'm not sure. You can set it up to synch using Wi-Fi only or your data plan. For documents, you will have to go to iCloud from your PC, but you can just synch directly for things like photo steams, contacts, calandars and Outlook.
You might find this link for apple support helpful: http://support.apple.com/kb/DL1455 for the iCloud method.
The other way is to use the Dropbox app on both your iPad and PC, which will give you 2GB of space for free. I'm don't like Dropbox for security reasons, but if your files are not of the sensitive sort it would probably be the easiest solution that doesn't rely on iTunes.