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First app I will open on my 3G S is the compass. Then I'll likely install Aqua Forest and see if there's a noticeable speed improvement. On the original iPhone and iPhone 3G, it can get pretty choppy the more water you have. Hopefully the 3G S can do a full screen of water smoothly.
 
First app I'll open in 3G S is the voice control.

First app I'll open in 3.0 will likely be Safari to make certain my Wi-Fi settings are correct and evaluate the launch speed and Javascript improvements.
 
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