Can anyone please help me to figure out how to get SA and MCE2005 working together, in particular how I can use Media center to schedule and record shows?
You need an "IR blaster" type device. They not only receive IR (infrared) signals from a remote but they can also transmit IR signals to control a set-top box.
Here are some directions from Microsoft Windows XP Media Center Edition 2005: Media Center and your set-top box
They talk about using a coax cable to the MCE tuner card but it may work with a video cable (composite, s-video or component) from the SA box to your MCE card. I don't use MCE so I don't know for sure. I know it would work with some of the other available media center software.