When you ignore the functionality iTunes provides to manage your iPad, that iPad can be viewed as a simple storage device; in fact, to view your iPad Photos gallery and the pictures it contains, you don't even need to have iTunes installed on your computer; furthermore, you can access these pictures on Windows 7 / Vista / XP and Mac OS X, but typically also on unsupported operating systems like Linux (Ubuntu or otherwise). All you need is a USB cable and port to connect your iPad to the desktop computer or laptop in question.
Here is the simple process to follow to view pictures from your iPad photos library on your PC:
Depending on your current Windows Explorer and Windows 7 settings, you will probably see thumbnails with preview for each picture inside the iPad Photos folder. As with Windows Vista and Windows XP, you can switch to icon view, details, etc. to suit your needs and preferences.
An iPad tutorial following this one will show you how to copy / backup your iPad photos to your computer, and yet another will explain how to transfer and move iPad pictures to your computer - in much the same way you do with a regular external drive!
Once you plug in an iPad into Mac OS X, it will appear as a storage device on the left pane inside Finder; if needed, open a new Finder window, and click on the iPad on the left hand side. Note that, depending on your settings and software installed on your computer, iTunes and/or a photo import software may open at the same time.
Depending on the Linux distribution, you should also be able to see your iPad plugged in as an external storage device. iTunes is not available for Linux of course, but you don't need it to access photos using iPad as a simple external storage device!