Just a bit of humor to contribute to this. One of the characters in my Planescape group is a Fighter. Eight levels of fighter, truly a beast on the field, but the player is great. And for purely story reasons, he switched over to Bard for a few levels. In game, it's been hilarious.
Of course, when making the changes to the character sheet, we all heard this:
" Woo Hoo! My Will save doubled!! "
Heh heh.