Ever thought that XP Embedded's Enhanced Write Filter would be really useful if you could selectively protect individual files, rather than having to lock down entire partitions? Well XP Embedded's Feature Pack 2007 is just what you've been waiting for... Check Out Milong Sabandith's White Paper on WindowsForDevices (http://www.windowsfordevices.com/articles/AT2380812751.html) .
So now there's no excuse for not building that PVR you always promised you'd do one day. Just think, you can reset the entire system simply by cycling the power but keep the EPG and recordings exactly where they were.