You can curl up with a tablet--particularly one of the smaller, 7-inch varieties like the Google Nexus 7 or Kindle Fire--and enjoy a good ebook. The ultrabook, of course, lacks the slate's book-like dimensions and isn't a good choice for leisure-time reading. This may change soon, however. The displays on some new ultrabooks, including the Acer Aspire S7 and Lenovo ThinkPad X1 Carbon, can fold all the way back, giving the devices a tablet-like flatness. Then again, it makes them extremely unwieldy to hold too.