We've written a MediaPortal extension (Download) that enables you to view and control your cameras from your HTPCs.
You will of course need iSpy installed and running on your network to use the
Setting it up
You will need to download and install MediaPortal on a computer around your home and then install the iSpy extension (More Info). You will also need to install the LAVFilters package (the iSpy Extension should prompt you to do this). If you have problems playing back video then check that the video codec in MediaPortal configuration for H264 playback is set to "ffdshow".
Choose your iSpy computer
When opening the iSpy plugin you will see a list of the available iSpy computers that you added above. This view auto-rotates all the live cameras running on the selected server on a 5 second interval.
Choose your cameras
Click to select your computer and then click the button at the bottom left to choose cameras running on that computer.
When you have chosen a camera you can then start and stop it or record on demand from the buttons underneath.
View your saved content
Click the button at bottom left to view any content saved by the camera