I have noticed that the driver side window rattles around 70mph consistently when i am driving in open air (nobody around).
When i get passed by large trucks, the window rattles at any speed.
I have used some moleskin strips in the window frame to try and stabilize the rattle, but it doesn't work very well.
I think I'll give the silicone bead a try. If it sucks, I'll scrape it out try something else. It is annoying to say the least.