Finally got it all back online - not that you can tell with the stats being screwed up lately. Also, I can't seem to register new devices - my wife got a new PC for testing Vista, and I was going to add another VM to my dedicruncher.
I can't get registered on either machine, though I
was able to re-install and re-register the 3
existing devices, both host and virtual, on my dedicruncher.
Edit:

Figured out a workaround for the problem with new agent registrations.
I had a couple of bogus agents in my list from when I forgot to name new agents while installing DIMES, before I un- and re-installed to allow proper choice of agent names. In any case, the bogus names have just been sitting there, so I figured, why not make use of them? Sure enough, using one of them allowed me to register my wife's new Vista PC; tomorrow I should be able to add the 3rd VM to my dedicruncher using the last bogus agent.
I'll just have to re-do it later when the registration problem is solved, so I'll have more accurately descriptive names for the 2 agents.