Brakes dragging...Help

[MEL1523@ACS.TAMU.EDU]

My brakes are dragging intermittently.  The diagnosis below is kinda long, 
but if you have even had a problem such as this, please let me know how it 
was fixed.

It has hapened twice now...both times with 3 people in the car on the 
freeway on a hot day.  I'll be driving along at 65 or so, and the steering 
wheel will begin to shake violently.  I thought it was that I had thrown a 
weight, but it comes and goes.  It's real violent, and shakes the gearshift, 
so I know the whole driveline is getting rocked.  I also noticed a loss of 
power.  The power loss was so bad, that the cruise floored it, and it still 
was losing ground.  On the way home this last time (we aborted the trip) the 
front brakes were squealing.  When I got home, I noticed that when pulling 
into the garage (which I have to inch into) I'd engage the clutch a bit to 
inch porward, and then the car would stop like the brakes were on (which 
they weren't).  I've tried it this morning, and the car coasts nicely in the 
garage (much differenly than before).

I tried to get it to do it again this morning by taking the car out on the 
road myself, but I couldn't get it to do it.

My theory is that the brakes grab for some reason, and this heats the rotors 
way too much at 65 MPH, and they warp a bit (I know it's not permenent, 
because they are fine today).  Then the warped,dragging rotors set up the 
shaking.  Root cause...intermittently dragging brakes.  Question is...which  
part is causing it?  Has anyone had this problem before?  For those of you 
who know that I just replaced the accumulator, It has done it before and 
after the replacement.

Any help would be appreciated.

 - Mitch