The problem is caused by the financial storm; most chip manufacturers became conservative and not optimistic about the economy; they layoff and change the production plan by reducing their production quantity. But somethings is out of their prediction! The requirements are so strong in this year, many parts are sold out all around!
This is true, but it occurred at the end of last year primarily. Starting around October/November orders started coming in to component and chip manufacturers. They had let their stock of parts deplete during the downturn and then had to quickly attempt to ramp up production again. This meant lots of parts shortages and long lead times for even relatively common parts like capacitors and inductors.
My experience over the last month is that these shortages are no longer an issue. Of course, I don't have anything by Atmel in my designs so hey might still be going through the same problems. My experience with Atmel is that while the engineering teams are great, the management is not particularly good. I wouldn't be surprised if they screwed up once again.