After reading about all of this axle boot stuff, I got under my car today and lo and behold, one of my inner boots is leaking. I have an IRS rear so there is a boot at each CV joint. It wasn't torn, just pulled out of the mounting ring where it was crimped between two parts - not adequately, I guess. There wasn't a whole lot of grease thrown about so I think it must have happened when I took the car out a couple of weeks ago. Lucky I caught it early and it looked like a pucker about an inch long.
When I bought my axles I bought an extra complete drive axle as a spare so the spare got swapped in. Quick call to a local driveshaft rebuilder and they've got two new pairs of mounted boots and can swap them while I wait for $30 bucks.
Everything's back to normal and I'll have another spare axle tomorrow. Then I'll get back to wire brushing and painting whatever looks rusty under there, which is what I thought I was gonna be doing today.... Can't wait to see what needs attention when I get to the front of the car!