I've just discovered Matt Neuberg's NotLight application. It's a proper application interface to MacOSX Spotlight search and vastly less irritating than the built in MacOSX interface.
For example Neuberg has replaced the type-as-you-go search which always frustrates me with a query interface that gives control over options like name vs. content search, whether the search is
diacritic-insensitive, as well as the ability to combine previous searches and search within specific folders.
It's a must-have utility for anyone using Spotlight regularly.