This might not be an "advanced" BlackBerry tip, but it is a way of life for those of us with an "advanced" case of CrackBerry Addiction...
When I wake up in the middle of the night to go to the fridge, bathroom or computer I no longer am turning on the lights and going blind or leaving them off and walking into walls and furniture thanks to my BlackBerry - it makes a Great Flashlight!
While I sleep my BlackBerry is never more than an arm's length away. When I wake up and get out of bed, I instinctually reach for it, hit the keyboad to fire up the display, and hold it away from my body bright side out as I get out of bed and take care of business. The BlackBerry display and keyboard throw more than enough light to allow one to find their way in a dark room, but not so much as to cause the eyes to go into that painful lights-on pupil shrinking mode. It's brilliant!
While this isn't a highly published BlackBerry tip, I don't think I'm alone here! According to a recent CrackBerry.com poll, 43% of respondents use their BlackBerry everyday in the bedroom, with another 20% using it in the bedroom often. I'm sure most of these users have discovered the joys of the BlackBerry Flashlight. It also works great for finding the key hole when you come home late at night and your house lights are off! Give the BlackBerry Flashlight a try...you won't be disappointed!