In Sparks, we went to Jiffy Lube, where we had "the works:" oil change, coolant flush and refill, fuel filter, rear differential, and several other services. The first was overdue (and we'd been down a quart of oil on the way back from Texas), the second was because of the replacement heater hose, and the others were due to be done anyway. When Lisa and I came back from walking down to Pizza Hut and having a pizza there, the van was ready to go and all was well. The temperature still reads a little higher than I would like, but it may have been doing that anyway and I didn't notice.
When we got home, the computer was waiting for me to log in normally, and booted just fine, albeit that the last six weeks' worth of files are gone. Fortunately, most of these are backed up elsewhere, and other can be recreated if necessary. The SMOFCon videos are up on YouTube, and the source files are still on Lisa's camera, but the editing I did to create the former from the latter is gone.
The irony to me is that I'd intended to do a system image last night, but I was so tired that I quit without setting it up. I don't know if that's bad or good. If whatever caused my computer to die was already there last night, a new system image would have been hosed as well.
Now I have to look at other backups to try and recover such data as I can.