Jim,
Can't believe the timing of your post! I washed my '99 today (bought brand new in Nov '98; 56K miles on it now)... I'm very anal about how clean I keep the thing, inside and out(just ask KatDiesel)

. I was wiping the inside of the bottom of the doors and noticed a spot on the bottom of my driver's door. Upon closer inspection, I found that the bottom of the door was rusted all the way through along an 8 - 10" section!!!
Looks like the place where the outer door skin and inner panel are rolled over each other was the start of the problem. I looked very closely at the passenger's door and it is just like new on the bottom.
The stealer is going to "fix" it free of charge under the 5yr/Unlimited outer panel rust warranty, but it'll never be "fixed" in my opinion. My father-in-law had his own body shop from about age 25 until he died a couple of years ago, and he would never "fix" a rust problem. He said the only fix was an entirely new panel, in this case, a whole new door!! Even if they cut in a new patch, it'll never be as tight as it was when new. Hope they seal the back side of the welds with something. The salt here in Nebraska will eat the paint off of anything.
As a side note, I was so pi$$ed off that I went and drove a new VW Jetta TDI for the fun of it! 50MPG sounds pretty darn good about now. Of course, I'm have second, third and fourth thoughts about it
Loren