A teacher I've been really impressed with lately is Deborah Ratner-Helzer. She has a dozen or so talks available at dharmaseed.org and at her own website (www.yogideb.com
What I like about her approach is that she presents the dhamma in a contemporary way without watering it down. I love IMS, but sometimes they can err a bit on the "lite" side, and she doesn't do that. Some of the best talks I've heard besides Goldstein's.
Let's see, who else...I always find Ajahn Sundara worth listening to. Just started with Bhikkhu Bodhi's Majjhima Nikaya series (http://www.bodhimonastery.net/bm/about- ... audio.html
) and it's great stuff. If you're interested in jhanas, there are hundreds of talks by Ayya Khema online, and she was quite a teacher. Sound quality is not great though.