What's the deal with 1.0?

I keep hearing people talking about version 1.0

What's the deal? I recently upgraded to version 22. But I'm getting the feeling that this is something different. Am I missing something on the main site? Where can I get it? What is it? How do I use it? What's the deal?

The Arduino IDE/platform is now at version 1.0.

http://arduino.cc/en/Main/Software

Arduino 1.0 is newer than Arduino 0022. There are some differences that might cause third-party libraries to not work until they are ported. Most of the time if there is an error it will be "Wprogram.h not found" and you can just edit the library to use the new Arduino.h instead.

Most simple sketches will work without changes.

for your delight and amusement
I just went through the (very low level) trauma of upgradingā€¦ http://arduino.cc/forum/index.php/topic,88313.0.html