well according to that article, to take advantage of the speed, you have instal the file to the RAM drive, and unless you have more than a gig of ram, you're not gonna be installing anyhting new
a ram drive is pretty useless for most things, one of the things right off the top of my head is when you boot with a win98 floppy or the like it makes a ram drive and stores some utilities in there.
the only way i could ever see it being useful in standard applications might be for games, if you install a game into a ramdrive, and then image it (so you can copy it back to the ramdrive...) then that would speed up your loading times, but you'd need a lot of ram to do this successfully unless it's a small game...
also everytime you shutdown, or your pc simply loses power the data in the ramdrive is lost, and it's more likely for the data to become corrupted if it's sitting in a ramdrive.