Thankfully, an app lets you watch movies or clips straight from your PC/Mac without the wire. It's called AirVideo available at the App Store.
For those who haven't welcomed this idea. Imagine yourself holding an iPad, iPod Touch, or iPhone while watching movies at the comfort of your own bed... or at the coffee shop or the airport? Any where with a WiFi would do, without the storage restriction that your iOS device is very limited of allocating all your movie collection.
AirVideo server for your computer. Once installed, you could add folder destinations of where your movie collection. Just make sure that all computers and the iPad are connected to one network.
On Mac's Menu Bar, an icon for AirVideo is being shown. Click on Preferences to access more options.
Under Preferences, the user may add Shared Folders as the designated folders you want to view on the iPad.
After finishing the set-up with our computer, we may see it here that the files we chose to be shared can now be seen on the iPad.
The options can either be expandable or collapsible for a better view.
To view the full-screen, just do the finger gesture to create such an option.
The app may look simple as it seems to be, but it's quite powerful if you can toggle some choices under the Settings. It can view Subtitles or even do a conversion and add to iTunes.
Download: AirVideo Paid Version or AirVideo FREE version