I have no idea why the Philips RFX2001/27 IR to RF Home Control Blaster is so hard to find online, but we picked one up at Target this weekend, and I'm loving it. We put the electronics behind closed doors as part of our babyproofing, and also because it makes the house look a bit more grown up.
Unfortunately, you can't control the Tivo through closed doors, and our newly mobile daughter is attracted to all the pretty blinky lights when the door is open. I've looked at various set ups like this before, but they start at a ridiculously high price point. This was only $50, took five minutes to set up, and works great.