Pete.
I decided to have a play with my strobes last night. I used two Yongou YN565EX guns.
I Placed a cacti flowering plant on my computer desk with some black card behind and took the linked photo.
With both strobes set to manual I used the following camera settings. Left hand strobe (A) to 1/128 power and the right hand to (B) 1/32 power. The onboard was set to just trigger the two strobes.
This is the result
http://www.flickr.com/photos/7045134...n/photostream/
Harry