Apple recently made a small change to the Purchased tab in the App Store on the iPad, allowing users to view their purchased apps not just chronologically, but alphabetically.
Select any given letter from the left-hand side of the Purchased tab to find the results you're looking for. Tap the clock above the letter "A" in order to switch back to a chronological view of all of your apps. Viewing items alphabetically still allows you to see both all of your apps, or just those that are not on your iPad.
The old way was a huge pain, the new way much better. Let's hope this is the kind of thing Apple keeps improving.
Update: Looks like it happened a couple weeks ago, according to iDB