On my Pearl the # key switches between the active profile and the vibrate profile automatically. The menu won't appear. You have to hold it down for about 5 seconds.
Bump. I'd like to know how to do it as well without having 'dial from home' turned off. I know it was very simple with my 8100(I believe it was as simple as holding down the button with the speaker on it) but I haven't had any luck with my 8800.
The # for vibrate only works on the non-qwerty keyboards. The "F" will bring you to profiles on the 8830 if you turn off dialing from the home screen (as mentioned above) but with a quick press -- no need to press and hold.