I’ve come across a really useful tool if you’re trying to learn mandarin chinese.
It’s a Pinyin Table complete with native chinese recorded sounds available here. This is provided free of charge by the good people at ChinesePod. (While you are over there you can sample a ChinesePod lesson for free and see what you think.)
This Pinyin Table would be especially useful if you are trying to learn how to say the sounds without having a teacher to copy.
I’ve found it helpful when teaching others pinyin, and I hope you find it useful too. :)