For anyone in the market for a new iMac or MacBook Air, please wait. Apple are looking to release Sandy Bridge-powered iMac and MacBook Air's with Apple stopping the flow of stock to resellers this week.
On the MacBook Air side of things, it looks like the 11.6-inch and 13.3-inch models won't enter mass production until late May with a launch sometime in June. This wait is worth it, the Sandy Bridge-powered MacBook Pro's are bloody awesome.
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