Oh. My. GAWD.
Over the years, I've been collecting the best instrument sounds I've found on the 'Net, and compiling them into a soundfont for when I want to compose music without actually having (or renting) the genuine instruments. And it sounds fairly decent, for coming primarily from freeware sounds (plus a few that came with Finale).
But after having seen it recommended frequently on the SONAR forum, I finally gave a listen to some of the demo samples for the Garritan Personal Orchestra.
Insert your favorite obscenity-laden expression of astonishment here! This thing sounds better than some of the instrument libraries that cost thousands of dollars. I mean, listen to this clarinet! Sampled clarinets never sound quite real. Or so I used to think.
I must have it.