The iBartNow for Android will help you find the train departure information from any station within the BART system. It's great for commuting, especially when you are trying to catch a train and not exactly sure when it should arrive at your station. I also use it from time to time to catch a train in a opposite direction and get a seat on my train a few stops earlier - for those experienced BART riders, you know what I mean.
This version has BART map as well, though it might be showing small on some phones.
Download it and give it a try!