Although it's not perfect, if you have questions about pronunciation, this is a pretty good site. You can put in any word (or even full sentences!) to get an idea about pronunciation, syllable stress, and intonation. You can also check out different dialects and languages.
This is a great site if you are working on a presentation. One student I had put his whole presentation into the tool and used it to practice.
Take a look. It's fun, interactive, and informative!