Egads, it's quite clear that Shakespeare wasn't meant to be read with a text to speech voice... or at least not with the Micorosoft Mary and Microsoft Mike which are representative of older MS technology (old in terms of what users will get with Vista). At any rate, check out this video if you want to see TTS acting at its worst.

This video suggests that having emotive TTS might be a feature worth supporting. I know that Loquendo has such a feature with its TTS, but it appears to be limited to a few pre-recorded emotive sayings.