I used to try the black card technique not long ago, but I find the results seem to be the same with my HDR/DRI images. So I've decided to stick with DRI imaging instead. But the thing I like about black card is that it gets the shot done sometimes in almost a single shot thus uses less space on the CF card.
I used to rely on HDR software like Nik Software, Photomatix but they don't give the results I want no matter how subtle the results are. Then I turned to manual tone mapping and DRI blending instead. Masking and Gradient are the only tools I use in CS5 to create my images; I take all the exposures I have, Mask and gradient them, then resize, and add a border and its off to flickr!!

I like surreality but it has to look "real" as much as it looks like in real life.