iOS 4 is now ready to be downloaded and installed on your newer iPhone OS devices including the iPhone 3G, the iPhone 3GS, the 2G iPod touch and the 3G iPod touch.

Here are the direct links:

• 2G iPod touch
• 3G iPod touch
• iPhone 3G
• iPhone 3GS
• iPhone 4

There are two main annoyances so far, one of these annoyances is that the optimizing images process takes a very long time when installing iOS4, the other problem is that performance on the iPhone 3G is said to be very poor.
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