Below is a collection of resources I've been using as I try and learn Mandarin. Do you have other suggestions to add to the list?
This site has a good Chinese/English dictionary along with some pronounciation sound clips.
Good character information plus other goodies like books in Chinese.
Another Chinese/English dictionary with sound clips.
An interesting podcast-format learning tool. This one is growing on me.
The first self-taught course I tried. Still the best as far as I'm concerned.
An online resource for structured learning of quite a few languages.