What is the difference between ipod touch and iPad?

1. iPad is bigger
2. iPhone has more apps but most of the apps that are on the iPhone also have iPad-optimized versions. However, apps like Answers.com's app is only optimized for the iPhone but can be used with black bezels on the iPad. Although iPad-optimized-only apps are growing, universal apps and iPhone-optimized only apps are still at maximum.
4. iPad is faster than the iPod touch
So not that much difference but keep in mind playing games is much more fun on a giant screen.