Any way to see my PC and Macbook's folders using iPad? Is there a way to do that?

The only way i can think of is to use dropbox but it doesn't support some common file types such as .mpg, .mobi, and .epub, and is limited to 2GB.

Also, doesn't it make sense if iPad comes with an app on iOS that can do it?
I haven't tried either, but there's Cloud Connect Pro that says you can


  View and manage files on your Windows, Mac, Linux, or other network services like Dropbox, MobileMe iDisk, Google Docs, or Box.net directly from the iPad [via SMB, AFP, FTP, SFTP or WEBDAV]


and FileBrowser to


  [a]ccess your NAS [via CIFS/SMB] without needing to turn your computer on.


CCP is clearly more feature-rich (with e.g. integrated VNC/RDP client, printing and SMB server) but also comes with a hefty price tag ($24.99) compared to somewhat more simple FB ($3.99).
There's also an Upgrade OS X article that discusses them both.