Wasn't today but over the weekend, worked on my drivers side window. I don't know about the rest of you but my DS window was really starting to get noisy and was noticeably slower and louder than the other windows. With the window rolled all the way up I used a letter opener to pull back the black trim as I went along spraying some liquid wrench down into the door cavity where the window sits on the track.
A few points to pass along. There are holes at the bottom of your door, what you spray in there is going to leak out the bottom. Keep your door open and let it drip on the ground (in my case, my driveway, doh). Its going to leak for a while so be prepared to leave your doors open for a while if you plan on doing this. I sprayed both sides of the window (interior and exterior). I think you really only need to do the interior, the exterior just foamed up and made a mess. I used the straw on the spray nozzle. Might have actually worked better without it as it would disperse more, and maybe not carry so much to the bottom of the door and leak all over the place. You're going to have to clean your windows after you work them up and down 1/2 a dozen times or so to work it into and along the track, so be prepared to do so. Unless you get something that doesn't smell as bad as liquid wrench, your trucks going to stink a bit. Do it when its warm and you can drive around with the windows down for a while (I think not using the straw will help with this also, again less liquid, more dispersement).
Overall though it worked great. My DS window is by far the fastest quietest window in my truck at the moment. I can start it the same time as the passenger (up or down) and its almost twice as fast as the passenger side. If I don't get a chance to do the others before it gets cold again i'll just have to wait for springtime to do it, so I can cruise around with the windows down, but it makes a huge difference, if you're having the same issues with noisy/sluggish windows, I'd think about trying it.