There has been a big DotA 2 Beta leak lately. The whole database of DotA 2 sound files has been leaked online by a Vietnamese player. He has made a dedicated YouTube channel and uploaded all the DotA 2 audio of all the hero voices including game announcer and other miscellaneous sounds.
You check the channel HERE .
You can see also, the courier model, the shop and other items.
And all skill icons HERE.