nos tablets? No momento, sao basicamente cinco. A aposta da Microsoft e o Windows 7, que esta em alguns tablets da HP e da Asus voltados principalmente para uso em empresas. O segundo sistema e o Android, do Google, baseado em Linux. Ele esta em tablets da Motorola, da Samsung e da Dell, entre outros fabricantes. Alem desses, ha o iOS, usado no iPad, da Apple. O quarto concorrente de peso e o webOS. Ele sera usado nos tablets da HP, que chegam ao mercado em junho de 2011. A RIM, fabricante dos celulares BlackBerry, tambem tem um sistema proprio. Ele e usado no Playbook, tablet que chega aos Estados Unidos em abril de 2011. Alem desses, ha muitas variacoes do sistema Linux criadas por cada fabricante. Os tablets sao similares aos e-readers (leitores de livros digitais)? No tamanho, sim. Mas as semelhancas param por ai. As telas dos tablets sao coloridas e sensiveis ao toque, enquanto as dos e-readers sao monocromaticas e nao respondem a pressao dos dedos. E-readers servem exclusivamente para ler jornais, livros e revistas, enquanto tablets possuem outras funcoes. ComparacoesAgora vamos comparar duas marcas de Tablets: Novo Apple Ipad 2 64gb +3g Mais Leve Core A5 Ipad2 7.31" Front camera 9.50" On/offSleep/wake Back camera Silent/Screenrotation lock Volumeup/down Home 0.34" Size and Weight1 Height: 9.50 inches (241.2 mm) Width: 7.31 inches (185.7 mm) Depth: 0.34 inch (8.8 mm) Weight: 1.33 pounds (601 g)Height: 9.50 inches (241.2 mm) Width: 7.31 inches (185.7 mm) Depth: 0.34 inch (8.8 mm) Weight: 1.35 pounds (613 g)(Wi-Fi + 3G model) Weight: 1.34 pounds (607 g)(Wi-Fi + 3G for Verizon model) Storage2 16GB 32GB 64GB 16GB 32GB 64GB Wireless and Cellular Wi-Fi (802.11a/b/g/n) Bluetooth 2.1 + EDR technology Wi-Fi + 3G model: UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz) Wi-Fi + 3G for Verizon model: CDMA EV-DO Rev. A (800, 1900 MHz) Data only3 Wi-Fi (802.11a/b/g/n) Bluetooth 2.1 + EDR technologyCarriers Display 9.7-inch (diagonal) LED-backlit glossy widescreen Multi-Touch display with IPS technology 1024-by-768-pixel resolution at 132 pixels per inch (ppi) Fingerprint-resistant oleophobic coating Support for display of multiple languages and characters simultaneously Chip 1GHz dual-core Apple A5 custom-designed, high-performance, low-power system-on-a-chip Cameras, Photos, and Video Recording Back camera: Video recording, HD (720p) up to 30 frames per second with audio; still camera with 5x digital zoom Front camera: Video recording, VGA up to 30 frames per second with audio; VGA-quality still camera Tap to control exposure for video or stills Photo and video geotagging over Wi-Fi Power and Battery4 Built-in 25-watt-hour rechargeable lithium-polymer battery Up to 10 hours of surfing the web on Wi-Fi, watching video, or listening to music Charging via power adapter or USB to computer system Built-in 25-watt-hour rechargeable lithium-polymer battery Up to 10 hours of surfing the web on Wi-Fi, watching video, or listening to music Up to 9 hours of surfing the web using 3G data network Charging via power adapter or USB to computer system Input/Output 30-pin dock connector port 3.5-mm stereo headphone minijack Built-in speaker Microphone 30-pin dock connector port 3.5-mm stereo headphone