Begining on jailbreak Help...

Here's a great chart that up to recently, has almost ALL of the idevices and corresponding jailbreak software.
If any of you out there don't know what jailbreak is, when you jailbreak your idevice, you get access to 3rd party apps, access to ALL files on your idevices,
tweaks to the basic functionality of your ios, and themes for the appearance of your iphone (obviously not the appearance of the physical idevice it's self, just on the ios it's self). Now wait, I can hear the readers yelling at me already. BUT IS IT LEGAL?!?!?!?!? Guess what everybody? IT IS!!! If you don't Believe me, check out these LEGIT articles posted about this very issue:
http://abcnews.go.com/Technology/us-government-jailbreaking-iphone-legal/story?id=11254253
http://www.wired.com/threatlevel/2010/07/feds-ok-iphone-jailbreaking/
http://www.redmondpie.com/jailbreak-unlock-iphone-officially-legal/
http://en.wikipedia.org/wiki/IOS_jailbreaking
And before you yell at me again, let me ask your next question for you. The 2nd article says jailbreaking voids your warranty?!?!?!
Yes, its true. Here's where it says jailbreaking voids your warranty:
The warranty does not apply…(c) to damage caused by operating the product outside the permitted or intended uses described by Apple;…[or] (e) to a product or part that has been modified to alter functionality or capability without the written permission of Apple. 
Another issue you are probably thinking of: Unlocking.
Unlocking is unlocking your iPhone's carrier, so you can use a different carrier that at&t or Verison.
And yes, UNLOCKING IS LEGAL, look here as to why:
http://www.engadget.com/2007/08/24/know-your-rights-is-it-illegal-to-unlock-my-iphone/
And void's the warranty for the same reasons as jailbreaking.
I hope this helped, Make sure you ask ANY questions you have!