Boy, I remember always wanting one of those as well...in fact, I just obtained an LCD mount that enables me to rotate the screen, and I use my PowerMac G4 (and my PeeCee at work) in portrait mode. It really makes much more sense (I spend 99% of my time reading/writing at the computer, and 0% watching movies). Seeing a whole page on the screen just makes so much more sense...
I would at least "try" it before passing it on }
...and if you like it, well, why not hang on to it? Using portrait monitors appears to be an acquired taste (otherwise more people would use them).