Sometimes, your phone's most useful productivity feature is its mobile Internet connection. Some wireless subscription plans include wireless hotspot capabilities baked in, but if yours doesn't, give EasyTether a whirl.
EasyTether's a rare breed: It lets you tether your laptop to your mobile device's broadband via USB without the need to root your phone. You'll need to install both the app on your phone and an EasyTether program on your PC, so you'll need to set it up before you're in dire need of the mobile Web. The free version is great by itself, but it doesn't allow you to browse sites with HTTPS encryption. It's worth paying the one-time, $10 fee for the full version to remove that obstacle.