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Differences with the 2012:

- Slightly faster and more power efficient processor
- Better graphics power (still integrated, but improved)
- Improved SSD performance
- 8GB RAM option
- USB 3.0
- High Def webcam

It's a personal decision as to whether those things are worth it over however cheap you can find a 2011 model. Personally I think that the 2012 models, especially the 13" models, are really great values with the new prices.
 
It's a personal decision as to whether those things are worth it over however cheap you can find a 2011 model.

Absolutely true. For me, the deciding factor was being able to get 8GB RAM and a 512GB SSD. Otherwise, I'd have happily saved some money.
 
2012 for sure.

I've got a 2011 and the new models are even faster with the SSD. I also like that the HD4000 graphics now support OpenCL which will give further boost in some apps.

USB 3.0 doesn't hurt either. As much as I would love to put my MBA on the market I guess i'll be looking at Haswell in 2013 as my next jump off point for a MBA.
 
IMHO, NO. But it depends what you use your laptop for. Im mainly doing excel sheets, accounting software, inventory software, and web browsing. For that, 4 gb ram and the i5 processor in my 2011 is more than enough.

I think a lot of people just want the latest and greatest. Most of the upgrades are pretty minuscule unless you NEED the extra ram or hdd space.
 
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