I know this thread is primarily about Silver Efex but for anyone considering the Nik Software bundle, the Color Efex Pro plugin has a popular filter called Pro Contrast, and one of the things it does is removes any colour cast from your image. And it seems to do this automatically, at least it did for me, on its default settings. And even though I am using a calibrated monitor, using this filter exposed a greenish yellowy colour cast I had in images captured with my Pentax K10D that I hadn't noticed before. But when I compared before and after it was obvious. And I then read that this is a fairly common thing for Pentax DSLRs. So with this, I was able to calibrate Lightroom to remove this cast and set it as a develop default to be applied upon import of all images from that camera. This is just so that I don't have to process every one of my images with the filter.
Color Efex has some other neat filters too, like film types and grain, a fog filter, graduated filters of various kinds, polarization, and one that adds an adjustable vignetting blur that kinda simulates the look of a Lensbaby.
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