Android: IP Webcam turns your Android Phone into a network camera by streaming the phone’s camera over its Wi-Fi connection for remote viewing.
Install the app, tweak the settings (login/pass, resolution, image quality), and then simply load up the URL it gives you in a web browser (I used Chrome for testing) or a client that accepts streaming video (I used VLC).
Below is the setup I used to stream a view from my dwarf Cichlid tank to my desktop. I used two suction cups and a black hair tie to secure the phone against the glass. The same setup could be used to peek out your window at your parked car or out your front door.