Instructions
Turn on your PS3, and then sign in to your user account.
Use the left and right directional arrows to scroll to the "Games" menu, and then use the up and down directional arrows to scroll to the "PlayStation Store" option.
Press "X" to launch the PlayStation Store.
Select the search field. Type "Hulu Plus" into the text box, and then press "X" to execute the search.
Scroll to the "Hulu Plus" application, and then press "X" to select it.
Scroll to the "Download" option, and then press "X" to select it.
Press "X" again to begin the download. Once the download has finished, your PS3 will automatically install the downloaded file. You can then access the Hulu application from the TV/Video Services menu on your PS3.