If you're at least looking to access ALL your files on your Mac or Windows, you really should try
ZumoCast. It's free and you can securely play your videos and music, download and open documents, either from your iPhone or iPad, or even through their website.
As for remote access with sound, I have yet to find a simple solution. The VNC protocol has no streaming audio feature like RDP does for Windows. So, I built a small Windows box and shoved it in the corner of my house like a dirty red-headed stepchild. I'm able to remote into it, use
PlayOn to stream Hulu, adult swim, Food Network, PBS, etc. Also, the
Wyse PocketCloud universal app I bought streams audio on RDP and has an add-in for a thin-browser feature that allows me to view full websites with Flash and Silverlight on my iPhone.