I'd say MediaFire. Free, easy to use, don't know what else you'd need.

But then, I've never really tried anything else.

Takuma Nuva

Soundcloud means the listeners wouldn't have to download it though, which is a huge plus I would think. Unless I haven't heard of all of mediafire's capabilities? *shrug*

We'll see what I end up with. XD

Maybe try Vocaroo? I've heard that's a good one for sharing audio. (Takuma Nuva might even know where I found this out xP)