Hello everyone,
The AppStore crashing problem can been seen everywhere with almost every iPod Touch 4th Generation user who has updated to iOS6. Even I have experienced this issue. A simple reset has been suggested and indeed, this does do the trick for many a bug on this new iOS. For me however, it did not do the job for the AppStore issue.
I finally opened the AppStore and went to the search tab, this is where I don't usually have long before it crashes. While in the AppStore, I reset my device by holding the power and home buttons down until the device rebooted. (No data or settings are erased with these actions)
After the device powered back on, I reopened the AppStore and not only was I able to view and download the desired app, but I was also able to smoothly slide and browse though other apps.
I recommend trying this course of action if you have the same issue.
I hope this helps you guys out.
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~Lt. Leviathan