I Spy Wi-Fi
Want to avoid booting up your notebook to a Wi-Fi connection until you know that a network is nearby? Smith Micro Software's $29 QuickLink Mobile Wi-Fi Seeker can help. Push its single button, and four flashing lights indicate the presence and strength of an available signal. The tiny (cigarette-lighter-size) device can detect signals from up to 300 feet away.
One thing we'd change: We'd add a light for multiple signals.
IRobot's $250 Roomba Discovery robotic vacuum cleaner is like a singing dog: The amazing thing isn't how well it works but that it works at all. But why criticize something that sweeps the kitchen while you enjoy dinner?
One thing we'd change: At times, it keeps sweeping floors that are already tidy.