Windows Sidebar Gadget
We've written a Windows Vista/ 7 Sidebar gadget that lets you view live video from any cameras attached to your iSpy computer. You can use this for free on you LAN. You can also use it remotely but that requires an active subscription.
You can click the video for an expanded view. In the expanded view you can choose from different cameras on your iSpy computer to display. You can set the refresh (frame) rate in settings. This number is the number of milliseconds between frame requests and will have a big impact on the amount of bandwith you consume. The gadget won't play video when the computer is in sleep mode or the gadget is not visible.