WEP is quite obsolete, no doubt. I'm not sure how believable it is that one is 'security auditing' in testing the hack-ability of a WEP enabled wireless network
That said, I think WEPBuster script makes a really good show-n-tell demo of just how insecure a company's wireless truly is. Popping up a few terminal windows in Linux isn't frightening to an IS engineer, but then, it 'looks' like rocket science to many VP incumbents, who remain convinced that only true eggheads pose a risk. Kiddie-scripts go a long ways to drive home just how vulnerable they really are. I'd vote to put WEPBuster in, pointing output TXT to desktop for demo.