Ernie,
Hi, first of all I would like to say that your app is hands-down one of the most useful apps I have for the iPad. I use it to study for Comparative Vertebrate Anatomy, and I have been recommending it to a lot of my fellow classmates (the share function is incredibly useful in this regard). I do, however, have some suggestions that would make this app even more unique and useful for others:
1) Could you add Dropbox support? I have to manually update my cards using a public URL from Dropbox, which works, but is inconvenient. If you added native Dropbox support, it would exponentially improve the backup and sharing capabilities of your app.
2) Could you add syncronization or uploading capabilities through WiFi or iTunes? This would make updating and creating cards much quicker!
Again, thanks for your app and it's worth every penny.
David