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Apple announced several additions to its computer lineup today, with a new MacBook laptop and iMac desktop computer, as well as a mouse with multi-touch capabilities. The company refreshed its line of iMacs today with additional two screen sizes: a 21.5-inch and 27-inch model. They both feature a new LED backlit displays with a 16:9 widescreen aspect ratio.

The new iMacs come in 21.5-inch and 27-inch flavors, and the 27-inch displays feature a whopping 2,569-by-1,400 screen resolution – higher than high-defintion 1080p resolution. The 21.5-inch iMac has a 1,920-by-1,080 true 1080p high-def screen. The 21.5-inch models are available with 3.06-GHz or 3.33-GHz Intel Core Duo processors, and the 27-inch models are available with quad-core 2.66-GHz Core i5 and 2.8GHz Core i7 processors, in addition to the Core 2 Duos to the options list. Memory sizes of 4GB are standard across the board (with a maximum of 16GB ), as are 500-GB or 1-terabyte hard drives. A 2-TB drive is an option for all iMac models as a Configure to Order (CTO) option.

The iMacs will ship with Apple’s new “Magic Mouse,” which features multi-touch technology such as found on the iPhone. It has no mechanical buttons, balls or scroll wheels and users can navigate using finger gestures. Tuesday’s announcement included the successor to the Mighty Mouse, dubbed the Magic Mouse. Apple reckons the wireless device is the first-ever multitouch mouse on the market.

Like the Mighty Mouse, the new mouse functions as one big button (Pushing down translates to a mouse click.), while tapping the sides of the top lets you effectively right and left click. The biggest news here, though, is the multi-touch tech that’s been added to the mouse. The top of the mouse functions as a multi-touch gesture pad, allowing you to swipe and scroll through documents, Web pages, the Finder, and more.