The better of them are ones that provide the kind of flexibility that they become something entirely new. Those are the tools that I’m interested in, and the ones I want to write about. Very few of the tools I use fit into the category of “That great tool” – one of them, though, is Total Commander.
What every IT Guy tends to keep, however, is a cache of essential utilities that he/she use with them all the time. As you become more tuned to the kinds of utilities you use, you’ll find ways to make them more available to yourself when you are at the client (at a moments notice).