Walmart has created an HTML 5 web app for their VUDU video streaming service. The web app allows them to get around Apple's revenue sharing requirements and deliver video content straight to consumers. Although it's probably not as nice as having a dedicated iPad app, the web app performs well.
Head on over to Vudu.com and sign up for an account. It's easy, and Walmart has a large selection of movies.
"Beginning today, iPad users can go to VUDU.com and browse through VUDU’s entertainment content library, which includes more than 20,000 blockbusters, Hollywood classics, independent films and TV episodes, then rent or purchase and watch them instantly. For one touch access to VUDU, customers can add a VUDU icon to their iPad desktops by clicking the “Add to Home Screen” button when on VUDU.com.
Head on over to Vudu.com and sign up for an account. It's easy, and Walmart has a large selection of movies.