I had this question after viewing Setup webcam to take photo every minute
I don't even know if this is possible but I would like to automate a WiFi cam to email me a photo from my rooftop at regular intervals - say every half hour. I only want stills and want them emailed to a digital WiFi photo frame. The idea is to enjoy the view that I don't have but avoiding killing the broadband with continuous video streaming. I have heard about yawcam which seems to have this functionality, but appears to be for Windows only.