This page lists sources offering APL training
APL Team Ltd / Kai Jaeger
Kai Jaeger has held APL training course for more than 20 years.
Lately he has developed "Sharpening your APL knife", a training course for advanced APL programmers. The course was held at Simcorp, presumably the largest APL-based software house in the world. The course was also offered at Dyalog 2008 in three units.
More details at http://aplteam.com/Training/index.html
APL2000 Training Courses for APL+Win, VisualAPL and APL+Unix/Linux
More details at APL2000 Training