For a brief moment yesterday, Amazon started taking pre-orders for the newest tablet endeavor from Samsung, the Windows 7-powered Series 7 Sliding PC.

Though the page has since been removed, the online retail giant reportedly listed the tablet/laptop hybrid at $649 – a mere $50 more than the Wi-Fi-capable iPad 2 from Apple. Amazon also revealed a few specifications about the tablet, including 2 gigabytes of RAM, a 1.5-gigahertz Intel Atom Z670 processor and a 10.1-inch touchscreen.

What sets the Samsung tablet apart, though, is a full-sized QWERTY keyboard hidden underneath the screen. This will undoubtedly be a perk for those uncomfortable with the digital keyboard featured on other tablets, such as the iPad and various Android-based devices. Though the tablet is bigger than some others, it still weighs less than 2.2 pounds and is highly portable.

Additionally, the tablet includes a dual-camera system, USB 2.0 connectivity and Wi-Fi capabilities with a 3G option.

Though neither Samsung nor Amazon have explained why the tablet was removed so quickly, it may have something to do with an upcoming press event presented by Samsung and AT&T. Earlier this week, the companies invited members of the media to join them on May 5 for a "special announcement," CNET reports.