Sent from my BlackBerry® powered by Virgin Mobile.
To your emails even after you specifically changed the setting in your Blackberry email preferences menu?
Simple. You have to remember that your emails go through RIM servers, which is their excuse for what I call the "Blackberry Tax" (every Blackberry provider in the country will tack some kind of fee to your bill and call it something like "Blackberry Service," in Virgin's case it is $10/month). You need to go to RIM's server and change your preferences there.
For Blackberries serviced by Virgin Mobile, it is not even hard. All you need to do is go to http://virginmobileusa.blackberry.com/ from your blackberry and it should recognize your device. From there you can edit or remove that annoying signature.
Make sure you do this from your Blackberry, otherwise it will ask you to enter your PIN and your Device ESN, which means shutting it down and taking out the battery. And it doesn't work, it will tell you to access the page from your device, so all this is going to do is buy you a 10-minute reboot.
On an unrelated note, I am still getting a kick of every time that Zemanta manages to find a related photo in my own Flickr feed.