Since ephedra/ephedrine can be hard to find right now, I'm on Thermocin. Its got Citrus Aurantium (4% synephrine..very similar to ephedra alkaloids), White Willow Bark (15% salacin...asprin) and guarana (22% caffine).
So, basically its a non-ephedra ECA stack. I like it, doesn't leave me jittery, but I only take 2 post lunch (instead of 3 in the morning, 3 in the afternoon).
It helps keep me goin at work. I don't attribute my above fat loss/mass gains to this supplement, at least not a significant amount of it.