I don't know if everyone has seen these yet or not, but here are a couple of ear training programs that I just started using. The first one is like a 'roided up version of the ear trainer on activebass.com. It's a free program, and can do just about anything. You can find it here. www.miles.be . The second one, I just got. I'm really excited about this program. It's pretty much an interactive interval training program. It will play a series of notes (giving you the starting position on the fretboard), then play them again with you playing along (this time showing you the position of every note). It is for guitar and bass. There is an option for 4, 5, or 6 string bass. And this one really does almost anything. It costs $40, but I thinking it's going to be worth it. They also have a free demo on their site. You can find it here: www.byEar.com .