Definitely get the 2012. It will have the latest operating system Mountain Lion installed. That is unless you can get a really good deal on a 2010. You can upgrade to Mountain Lion for $19.99.
Macbook air
The 2012 MacBook Air does not have a built-in HDMI port. However, it can support HDMI output through the use of a Mini DisplayPort to HDMI adapter. This allows you to connect the MacBook Air to an HDMI-equipped display, such as a TV or monitor.
The MacBook Air was probably slightly below the MacBook. As of 2012 they no longer make a MacBook as the Air took it's place. It's a moot point now I guess.
In 2012, Apple sold approximately 4 million MacBook Air units. The MacBook Air was popular during that time due to its sleek design, portability, and improved performance. Sales figures contributed to Apple's overall success in the laptop market during that year.
Try the Samsung Series 9. It's thinner than the Macbook Air, and has much better specs.
1280x800 (Earlier than Mid-2009) 1440x900 (Late 2010)
No, the Macbook Air does not break easily.
Macbook Air.
You can use rubbing alcohol and fire to clean it
The MacBook Pro cases are much larger and sturdier the the MacBook Air cases.
The camera built into current Macs (including the iMac, the Macbook, the Macbook Air, and the Macbook Pro) is known as the iSight
MacBook Pro is the best you can get