iOS: If you're travelling and need to find a wireless network that you can use to log in to your VPN and check email, pull up a car reservation or verify a hotel booking, 4sqwifi is a new iPhone app that -- as long as you're already signed up to use Foursquare -- can show you which check-in points have free Wi-Fi or Wi-Fi networks you can log in to.4sqwifi is a new app, and it uses crowdsourced information, so there are definitely some bugs to work out, but it's worth a shot if you travel often and you're looking for a Wi-Fi network to borrow for a short period, or you're staying in a hotel that doesn't offer Wi-Fi and you want to know if there's a nearby network you can use while you're there. When we tested the app, we found some duds and a few bugs, but the app works as advertised after it has been linked to your Foursquare account. Best of all, the app is completely free, and available now in the iTunes App Store.
How do you find free Wi-Fi to use on the go? If you do use free Wi-Fi, make sure to stay safe while using it. Share your tips in the comments below.