That is so true. When people ask "How hard can it really be to write a search engine these days?" I have been known to ask them to speculate on how they might go about it and then point out the challenges of knowing what data you have vs what data is asked for. Search is particularly interesting because the more time you spend the better your answer can be, and its always challenging to 'draw the line' between fast and relevant. But that is also what makes it so fun :-)