I dodged a bullet! Overnight, the water leaked out to "basically nothing detectable" level, so the leak stopped leaking. Pulled radiator shround, fan, and pulley on the water pump shaft on my way to pulling the water pump, then had a brainstorm: Before going any further, fill the radiator up.
Did so. Sure enough, after adding a few quarts of water, the leak started. With the fan and associated stuff gone, I've got a goo view of most of the water pump (other than the section the harmonic balancer covers up - that was the next piece to pull)
Break out flashlight, and *BINGO* - There's a hose - not certain what its exact purpose is (and don't really care right now!) to the water pump, covered by the pulley and obscured even further by the fan, and it's dribbling steadily. Not a drop of water anywhere else to be seen.
Clamp is tight, but it's still dribbling. Loosen clamp, leak turns into a gush (or as close ass a hose this size can come to being a gush). Pull it completely, and find that I apparently split the end of it while either removing or re installing it the other day. Cut off an inch to get to clean hose, re-install, fill radiator, and leak is GONE WITHOUT A TRACE!!!
YAY ME! :) The Beast lives again, and heads out on its one-way trip to its (and my) new home later today.
Thanks to everybody for advice and encouragement - Gawd, did I need it. Having this thing die on me *WHEN* it did was seriously bad timing. Not that any breakdown ever happens at a "good" time, but this was particularly bad, what with my soon-to-happen move only 3 days away at the time it happened.
Anyway, in case anybody cares, I'll be falling silent for at least a day or two as I get to, and situated in, my new digs. Try and keep the place from falling apart while I'm not around to keep it together, huh? :)
And pray to whatever god(s/ess/es) you pray to for an uneventful trip, wouldja? "Yeah, he's drivin' a beater-mobile - he needs all the help he can get" :)