It appears to be an issue with the new IOS6 version of the app store on the ipad. You need to have less apps to show as purchased to avoid this crash. Yes, this is dumb, and Apple messed up the app store by not testing this before release, but that is the post-Jobs Apple I guess.
I had 1200 apps (yes!), but hid lite/free versions of some, and other things that I got as free for a day that I never use (storybooks, etc.).
On your PC, open itunes (and yes, the new itunes ***** too, press CTRL-S to toggle the pane on the left).
Under Store, click iTunes Store
Click App Store at top of main window (in gray)
On the right you will see App Store Quick Links, click Purchased
As you mouse over items, you can click an X in the upper left corner of them one at a time
NOTE: This does not delete them, just hides them from showing as 'purchased' in that view on your ipad/iphone
Once I was down to 900 or so (I hid 300 one by one!), then I could pull up purchased items on my ipad (note that my other ipad under IOS5 did not have a problem, so this is an IOS6 app store bug)
You can unhide items by using itunes on your PC, go under the menu Store, then under your account will be View Hidden Purchases. You can unhide one by one, or all.
Clearly, having too many apps to show overwhelms the new (and improved - ha!) app store on the ipad (or iphone using IOS6). You hide some apps, and I think purchased items will start to show for you too in IOS6.
Hey Apple, every hear of quality control? NO? Hmmm.....