The car in question is a 1993 Accord EX with 160K.  Today while driving
home I started to hear a very loud metal-on-metal type screeching.
This did not start until I was out of the parking lot and had gone a
hundred yards or so.  When I pulled over it stopped completely.

I turned onto a side street (screeching while I went) and walked around
the car to see if anything was dragging, but nothing was.  I turned the
car around and drove home (less than a mile on a 30 mph road) with no
further screeching.

I read old posts about the distributor making a noise like that, but
this seemed like it came from one of the bottom wheel areas, and it
stopped when I stopped moving.  Somebody mentioned a rock getting
caught up in the brake pad, which would make sense as after I turned
the car around it might have dislodged.

I have to get it inspected soon anyway, but is there anything serious I
should be worried about?  I will probably have to drive ~20 miles on
Saturday before I'll have a chance to go to a garage, unless it's very
serious.

Thanks...