Remote video monitoring of a home, whether for pets or security, remains one of the most common home automation questions that I receive. A new product, The Vue Personal Video Network, looks like a good solution for many cases.
I haven't tried it, but it's nice that you get two cameras in the basic kit, and can add up to 50 (!) more if you have the desire and cash. I also like that the wireless cameras have to be associated with the base station so that their signals can't be evesdropped. (That's a common problem with other non-Wi-Fi wireless cameras.) Their use of a central monitoring service is what simplifies setup and provides ease-of-use, but it does mean you'll have ongoing annual expenses.
All in all, it looks like a good solution. If you've tried it out, drop me a line and let me know what you think. The basic kit is also available on Amazon with many useful reviews.