What's so hard to jailbreak on OS 4.2.1?
What's so hard to jailbreak on OS 4.2.1?
...and why would 4.3 be able to be jb'd so quickly.
You can dual boot your computer so you can use windows and mac.
They've had an untethered jailbreak for life for the iPhone 4 since it was released call sprit. It can only be closed by a hardware upgrade not software. The 4.3 jailbreak uses some part of this exploit to the best of my understanding...