What are the benefits of iPhone jailbreak?
I Jailbroke my iPhone 4 as soon as the jalibreak was released and had my iPhone 2G Jailbroken before that.

For me it's not about illegally installing applications, it's about intsall tweaks and applications which Apple can't or won't allow into their App Store, for example:


Winterboard:     Complete themeing system.
SBSettings:      Easily enable/disable settings from within
any application.
Infinifolder:        Remove the 12 Application limit from iOS4 Folders.
QuickReply SMS:      Reply to SMS messages directly from the message
alert with a popup keyboard and then
instantly return back to what you
were doing.
Cyntact:     Show contact pictures in Contacts.
BossPaper:       Rotating wallpapers (Was available before iOS 4 allowed
them)
Categories:      Allowed Apps in folders years before iOS4 did!


The few short weeks I had my iPhone 4 without it being Jailbroken I found it hard to use as I'd got so used to the small tweaks I'd installed my Cydia, most of them I had purchased.-