Here are some of my top reasons:
#1 Complete file system access (especially with iFile).
What does this mean? It means your files are no longer trapped in their apps.
You can type up a document in Pages, then do any of the following:
- copy it over to a bluetooth/wifi file-sharing app, and send it to other devices, or a PC
- copy it over to a wireless printing app
- copy it to any other app you prefer
- OR, connect a USB flash drive via the camera connection kit, and copy the document over to the USB drive.
Heck, it works the other way around. Via iFile, you can connect a USB disk via the camera connection kit, BROWSE YOUR FLASH DRIVE, and copy any file from it to any app on your iPad (like to Pages, etc.) Makes it easy to copy files/documents from ANYWHERE onto your iPad, without needing a PC with iTunes.
#2 Flash
There are quite a number of alternatives.
You can get "Frash", which is actually "Flash for Android", hacked to work on iOS.
Then, there's also:
- Cloud Browse: used to be on the app store, not anymore I think, but can still be gotten via Cydia. It's like using Firefox on a PC, with Flash, AND JAVA applets as well.
- Skyfire: was in the appstore for quite a while, but was pulled out. You can also find this via Cydia, and it will play flash videos for you.
#3 Jailbreak-only apps
Here are some to get started:
- MyWi: lets you turn your iPad into a wireless access point. Good for 3G iPads wanting to share their internet to other wireless devices (eats up your battery like a ***** though)
- SwirlySMS: send and receive SMS messages from your 3G iPad.
- iDos: this was on the app store for like a day before it was pulled. But its still on Cydia. A full DOS emulator, people have done cool stuff on it, like play legacy DOS games (like Commander Keen, or The Incredible Machines), and even crazy stuff on it like install Windows 3.11, and then install Warcraft II into that. I haven't tried it yet, but even crazier stuff like installing Windows 95, then installing Starcraft in it, MIGHT be possible.
- Speaking of emulators, there are tons. Like PSX4ALL, which allows you to play Playstation 1 games on an iOS device. etc. The possibilities are endless.
- And speaking of endless possibilities, there's also the (coming soon) Android OS installed on an iPad. Dual-boot iOS and Android pad = even more crazy possibilities.