I use a Nikon D70 with a firmware upgrade to D70S for most of my work, and a Minolta DiMage Z-1 as a "pocket camera". I've also got a couple 35mmSLR's (both Minolta) and a Samsung 35mm non-SLR.
My primary camera is the Nikon. I use that pretty much exclusively for my professional work, although just for grins and giggles pull out the DiMage for "fun" after the work is done with the pro gigs.
Tomorrow night I'm booked to shoot a band, I'll use the Nikon for the stage work, but very likely will switch to the DiMage for any candids I do offstage. The DiMage is lightweight and "manueverable" in tight, faced paced places (like dressing rooms) that the Nikon can be cumbersome to use. It 100% depends on the available lighting though. I do not use flash for this type of photography.
Additionally, graphics people and photo editors much prefer digital, as there is no degradation like there can be with moving film to digital via scanner.
Anne