From the April 2011 indigo issue, which also has great profiles on many artisans who specialize in making handmade goods.
It’s a shame that companies and designers outside of Japan do not really experiment with indigo dyeing much. This scarf that I have from Pure Blue Japan has one of the most complex shades of blue that I’ve seen (it also gave me a bit of a blue colored neck the first time I wore it too).
45rpm is of course known for their hand dyed indigo clothing.
There was also a short but interesting section on indigo dyeing methods and products in the recent issue of Free & Easy.