Wi-Fi is super convenient, but hotspots can be hard to come by, and many proprietors charge a pretty penny to use them. One easy way to enhance your connectivity options is to add a 3G Wireless WAN (WWAN) data device to your laptop. The three big carriers (Verizon, AT&T Wireless, and Sprint Nextel) all offer such devices, available in several formats: PC Card, ExpressCard, or USB. The best place to get one of these devices is at your wireless telecom company. If you commit to a service plan at the same time, their prices range from free, for AT&T's USBConnect 881 (it's free after rebates, anyway), to about $150, for Verizon's USB727 Modem (above). Performance doesn’t vary much from carrier to carrier or from device to device, so buy the one that has the best coverage in the area where you typically work or travel.