Yongnuo have released a stackable 64 LED light called the SYD-0808. Read the specs on the Alibaba page. Units are available now on eBay for around $38 apiece.
Kirk Tuck has published a review of the ProMaster 42LED light:
If you are a Canon 5D mk2 or Nikon D3s user this may be all the light you need for Stygian weddings, breaking news and wacky studio shots. Â It’s so easy to set up, doesn’t need to be sync’d and works at all shutter speeds. Â If you own fast glass, this is your “gild the lily” light for available light situations that need a touch more control.
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