How to increase size of the Spotlight search results window? Is it possible to increase window width of the Spotlight search results under Mac OS X 10.6.6? I mean the semi-transparent "instant search result" window appearing at the top right corner under magnifying glass, not the Finder window.

The standard window is too narrow: longer file names or Dictionary word translations just don't fit there. Why not using more screen space for the search result?
Have you looked at using 'Alfred' as search tool - It's free on the App Store and very flexible, and has a wider results view. If you try it, take a little time to get familiar with the options - I find it a fantastic time saver.