The Arduino IDE software version 1.6.0 has been released. Get it from the Arduino downloads page.
Elektor Electronics magazine have a nice article that summarizes the new features of the IDE on their Elektor News page.
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Electronics for Beginners and Beyond
I tried the latest version to compile some Ethernet library based code. My ethernet code makes use of the W5200 chipset instead of the W5100 chipset. I could not get it to compile. I hope to find the errors and fix it later. I rolled back to the previous version for now.