Reference materials like Wikipedia and Dictionary.app often give pronunciations for words. For example, Wikipedia gives this for "titanium":

/taɪˈteɪniəm/

And Dictionary gives this:

|tīˈtānēəm|

I'd like an app or a Service or something that would pronounce these words for me. I'd get to choose the voice and the speed.

Another option would be to enhance the "say" command.