Version Cue was a good idea that never took off. It was too hard to use for small agencies and not robust enough for large ones. Evolphin Zoom 2.8 fills the gap left by Version Cues demisequite nicely, too. The software is easy to install and set up on either Macintosh or Windows.
TypeDNA has several features that make it worth far more than its $39 price. Its a capable font-management utility, with all the basic features of any font manager: you can group fonts into sets, see detailed information, view character sets, flip through font samples, view by font foundry, see only serif or sans-serif fonts, etc.