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Get a preview of Xcode 4 — the next generation of Apple’s integrated development environment for creating Mac OS X and iOS applications.
With a brand new interface, compiler, debugger and dozens of new features, Xcode 4 is faster, easier to use, and more helpful than ever before. Quite simply, Xcode 4 will help you write better code.
Read about the many new enhancements and download the developer preview to see what’s new in Xcode 4.

Learn More (Source: apple.com)

As rumored Apple has just released iOS 4.0.1 for the iPhone. As usual we recommend NOT updating until more details about the firmware are discovered.

Also it is VERY important that you have your SHSH blobs for 4.0 saved. Apple will stop signing 4.0 in just a few minutes/hours.

Follow one of these tutorials ASAP:
- Windows
- Mac

It’s thought that the 4.0.1 update will only change how the signal bars are displayed and possibly resolve some bugs. New features will likely be reserved for iOS 4.1. There is no baseband update in 4.0.1 so it will be unlockable.

Source: http://www.iclarified.com/