Recently spent some time getting my Myth box up and running in case my Tivo dies - Tivo is effectively extinct over here now . My Myth is close to fully working now.
Hey I just built one of those, myself. If you didn't spring for a tuner card with hardware compression, I'd recommend adding one along the way - you get a lot of neat features that way. For instance I can watch live TV on my Mac laptop, anywhere in the apartment, over my 802.11g network. Very cool. I use the Hauppauge PVR-150MCE - cheap and effective under the IVTV 3.x drivers.
I'm currently looking at the best way to transfer ~25 years of 35mm photos (just snapshots - nothing too high quality) to digital format to put them into Myth.
I'd either use an automatic slide scanner, or I'd send the photos off to a good production house and pay them to do it. It's a mind-numbing task to do it yourself on a flatbed scanner, probably not worth your time. The production house will have a stack-fed scanner that they can use.