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I got it done this morning after reading the posts last week about it (and the link to kwik's thread). My front windows were starting to act a little slow. Took about an hour for all four as kwik suggested, and definitely made a difference. I found the plumber's silicone valve lube (like very thick vasoline) at Lowes near the plumbing solder supplies for about $3.00. It looks like a small amount, but it goes a very long way. I don't think I even used a 1/4 of the container. Also sprayed the fabric tracks (top and down in the doors) with CRC silicone spray as someone else suggested. I would think this drastically decreases the load on the motors extending their lives, so if you're not looking forward to buying a $100-$150 (potentially x4!) window motor(s), take the time and do this...
There are three tracks that need lubed -- it will be obvious when you take the panel off. The first one you can see with it up, the second & third places you'll see when you roll it down. I think it's easiest to reach when it's a little over half way down. I used a flat blade screwdriver to smear the lube in the one that's a bit hard to reach.
The panels come right off after removing the screws under the window switch & reflector (only two screws on each door). If you've never had them off, you simply lift them up & off. The you'll have to pull the cosmetic piece where the mirror mounts off the front doors, too (they just pull straight off). Also, I peeled the plastic seal (you'll see it when the panel comes off) enough to get access to the window tracks. It was sticky enough so I just stuck it back in place.