Same Question in another forum - ANSWER!
Hi there! dkelly701 told me this in another thread of people asking the same question. I just switched from Curve to Droid and was missing that feature BIG TIME!! I even reinstated my landline so I could shut off the Droid at night (silly me)! I haven't tried it yet, but I feel confident it'll work once I take the time to figure it out - here's the info:
Setting Profiles will allow you to do this and much, much more. What's even better is, once you set it up, you don't have to remember to change your profiles, it does it automatically. I have 11 different profiles that control everything from the volumes of the individual ringers, vibrate, display brightness, bluetooth, WiFi, etc, etc, etc,. Check it out, spend some time to understand how it works, set it up and then you can forget it.