While I was fixing a WiFi issue at work today, I needed to find a free tool that showed my WiFi signal strength. A quick bit on Google brought me to Xirrus Wi-Fi Inspector. The Xirrus Wi-Fi Inspector is a powerful tool for managing and troubleshooting the Wi-Fi on a Windows XP SP2 or later, Vista, or 7 laptop. Built in tests enable you to characterize the integrity and performance of your Wi-Fi connection. It’s a great app — quick to download and install and it showed me everything I needed right out of the gate. Highly recommended.