I've been using YAWCAM. It allows you to call up a still image via a WAP website any time you want and also can be set to e-mail you a picture every time it detects motion.
Someone also set me up with a program that will e-mail a picture at a preset interval. I have mine set to send a picture every 2 hours while I'm at work.
You can check mine out at
http://mikeyp1.notlong.com
Mike