A few posts back, I wrote about arranging apps on your iPad. Here’s more on managing apps and creating app folders for your iPad, taken from the 2nd edition of my guide to the iPad.
Arranging Apps in iTunes
Need to really clean up your screens? Connect the iPad to your computer with the USB cable. After iTunes loads, select the Apps tab from the row of tabs across the top of the screen.
You can then rearrange a single screen or drag and drop between screens as much as you like. Want to quickly place an app from the app list pane on a particular screen? Select the screen number you want on the right, then uncheck and recheck the app from the app list pane on the left (in the checkbox). Double-clicking the app in the app list takes you directly to the screen where that app appears.
You can also organize apps by creating folders while you’re in iTunes. Drag and drop one app on top of another. In iTunes you can also select multiple apps before creating the folder. Select the first app you want to put in a folder. Use command-click (Mac) or control-click (Windows) to select additional apps for the collection. Then drag the entire pile of apps onto the last app you want in the folder. I suggest you do most of your app organization in iTunes while the iPad is connected to your computer. You can put up to 20 apps in a folder for a total of 4,406 apps. If you need more apps than that you have a bigger problem than app organization. Get help.
By the way, the view of these app screens can change from portrait (above) to landscape (below). It all depends on the orientation of your iPad when you connected the sync cable and syncing began.