I've been shooting nudes for almost a year. I do find it handy to have a digital around to use like a polaroid to prove the exposures out. Normally with portraiture you can focus on light and exposure on the face but with nudes you've got to worry about everything from head to toe, how it all comes together. Definitely more of a challenge. But more rewarding when you find success in it!
<rant> I'd like to be able to do so, but I've found that my digital camera's idea of 100 ISO is different than my flash meter's version. My digital camera is at least 1/3 if not 2/3 stop faster than my meter. While I could recalibrate my meter to match the digital camera, it would then NOT match my film, which would mean keeping two different meters, and re-setting my power levels on my power pack every time I did a "digiroid". This is something I've noticed about digital cameras, actually... my previous "high end" digital SLR was a bit slower than my meter, now my new one is faster, and in my portrait lighting seminar this fall, everyone in class who was shooting digital was getting slightly different results - some faster, some slower. It was very frustrating. I thought the whole point of ISO was that it was a STANDARD. </rant>