If you are interested in video guides, here's a good one to untethered jailbreak your iPhone 4, 3GS, iPod touch 4G, 3G or iPad using Redsn0w 0.9.6rc16.
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If your iPhone 4, 3GS relies on ultrasn0w unlock you should stay away from redsn0w, you have to restore your iPhone via pre-jailbroken custom firmware, simply you have to [You must be registered and logged in to see this link.] or [You must be registered and logged in to see this link.] to preserve your old baseband to unlock it with [You must be registered and logged in to see this link.].
[You must be registered and logged in to see this link.] Redsn0w 0.9.6rc16 for Windows
[You must be registered and logged in to see this link.] Redsn0w 0.9.6rc16 for Mac
[You must be registered and logged in to see this link.] iOS 4.3.3 for iPhone, iPod touch, iPad
[You must be registered and logged in to see this link.] iTunes 10.2.2
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[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
If your iPhone 4, 3GS relies on ultrasn0w unlock you should stay away from redsn0w, you have to restore your iPhone via pre-jailbroken custom firmware, simply you have to [You must be registered and logged in to see this link.] or [You must be registered and logged in to see this link.] to preserve your old baseband to unlock it with [You must be registered and logged in to see this link.].
[You must be registered and logged in to see this link.] Redsn0w 0.9.6rc16 for Windows
[You must be registered and logged in to see this link.] Redsn0w 0.9.6rc16 for Mac
[You must be registered and logged in to see this link.] iOS 4.3.3 for iPhone, iPod touch, iPad
[You must be registered and logged in to see this link.] iTunes 10.2.2
[You must be registered and logged in to see this link.]