Unless you've been living under a rock (or using a PC), you've probably heard that Steve Jobs unveiled the world's thinnest notebook at last week's Macworld Conference & Expo. This wafer-thin powerhouse boasts an Intel Core 2 Duo processor, 2GB of memory and your choice of 80GB PATA hard drive or 64GB solid-state drive. Plus, it fits inside a manila envelope (although you might be better off with one of these). Macbook Air starts at $1799, and the souped-up model is $3,098. That's not the only news from Macworld; you can now rent movies through iTunes for $2.99 (3% Cash Back), and Apple TV is now only $299!