Rob Griffiths over at MacOSXHints has discovered MoRU, an app that builds upon the power of Spotlight with its offering of far more customizable search queries. Instead of searching for everything across your entire Mac with Spotlight, consider how much handier it would be to say: "show me these specific kind of files, with exactly X in their name, made between this year and that year." If this concept seems a little strange, check out Rob's post for a couple real-world examples of when a blind search across everything on your machine becomes less productive than Apple advertises.
MoRU is shareware that costs $10. If you're as unhappy with Spotlight's blind, system-wide search as Rob, it sounds like MoRU is definitely worth taking for a spin.